CORNING INC /NY
8-K, 1996-12-02
GLASS & GLASSWARE, PRESSED OR BLOWN
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  -----------

                                    FORM 8-K

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(D) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

               Date of Report (Date of earliest event reported):
                               November 26, 1996
                               -----------------

                              CORNING INCORPORATED
                              --------------------
               (Exact Name of Registrant as Specified in Charter)

                                    NEW YORK
                 (State or Other Jurisdiction of Incorporation)

       1-3247                                              16-0393470
- --------------------------------------------------------------------------------
(Commission File Number)                       (IRS Employer Identification No.)

                  One Riverfront Plaza, Corning, New York 14831
                  ---------------------------------------------
               (Address of Principal Executive Offices) (Zip Code)

               Registrant's telephone number, including area code:
                                 (607) 974-9000
                                 --------------
<PAGE>
     Item 5. Other Events.
             ------------- 

          Attached for filing as an exhibit hereto is the item listed in "Item
          7-Financial Statements and Exhibits" below. Such item is being filed
          in connection with the distributions to Corning shareholders of record
          on December 31, 1996 of all of the outstanding common stock of Corning
          Clinical Laboratories Inc. (to be renamed Quest Diagnostics
          Incorporated) and Covance Inc.

     Item 7. Financial Statements and Exhibits.
             ----------------------------------

     (c) Exhibits.


    99.1  Selected pages of the Information Statement of Corning Incorporated,
          dated November 26, 1996 (pages 18-32)

                                   SIGNATURES

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                                        CORNING INCORPORATED

                                        By: /s/ A. John Peck, Jr.
                                           ----------------------------
                                        Name:   A. John Peck, Jr.

                                        Title: Secretary
                                              

Dated: December 2, 1996



                                 INTRODUCTION 

   
   On May 13, 1996, the Board of Directors of Corning (the "Corning Board") 
approved a plan to distribute to Corning shareholders (i) the clinical 
laboratory testing business being conducted by its wholly owned subsidiary, 
Quest Diagnostics, in the Quest Diagnostics Spin-Off Distribution and (ii) 
the contract research business being conducted by Quest Diagnostics' wholly 
owned subsidiary, Covance, in the Covance Spin-Off Distribution. The 
Distributions will be effected by the distribution of a dividend to holders 
of Corning Common Stock of all of the outstanding Quest Diagnostics Common 
Stock, followed immediately by the distribution of a dividend to the holders 
of Quest Diagnostics Common Stock of all of the Covance Common Stock. Since 
the Covance Spin-Off Distribution will be immediately after (but on the same 
day as) the Quest Diagnostics Spin-Off Distribution, each holder of Corning 
Common Stock will, after the Distributions, not only hold shares of Corning 
Common Stock but also shares of Quest Diagnostics Common Stock and Covance 
Common Stock. As a result of the Distributions, Quest Diagnostics will own 
and operate Corning's clinical laboratory testing business as an independent 
public company and Covance will own and operate Corning's contract research 
business as an independent public company. On the Distribution Date, Corning 
(in the case of the Quest Diagnostics Spin-Off Distribution) and Quest 
Diagnostics (in the case of the Covance Spin-Off Distribution) will effect 
the Distributions by delivering all of the outstanding shares of Quest 
Diagnostics Common Stock and Covance Common Stock to Harris Trust and Savings 
Bank, as the distribution agent (the "Distribution Agent") for transfer and 
distribution to the holders of Corning Common Stock and Quest Diagnostics 
Common Stock on the Record Date. The Corning Board formally approved the 
Distributions and declared the dividend of Quest Diagnostics Common Stock on 
November 20, 1996. The Board of Directors of Quest Diagnostics (the "Quest 
Diagnostics Board") declared the dividend of Covance Common Stock on November 
20, 1996. It is expected that the Distributions will be made on December 31, 
1996. 
    

   Quest Diagnostics' principal executive offices are located at One Malcolm 
Avenue, Teterboro, New Jersey 07608, and its telephone number is (201) 
393-5000. Covance's principal executive offices are located at 210 Carnegie 
Center, Princeton, New Jersey 08540, and its telephone number is (609) 
452-4440. 

   Shareholders of Corning with inquiries relating to the Distributions 
should contact Investor Relations, Corning Incorporated, One Riverfront 
Plaza, Corning, New York 14831, telephone (607) 974-9000, or Corning's stock 
transfer agent Harris Trust and Savings Bank, Shareholder Services Division, 
P.O. Box 755, Chicago, Illinois 60690- 0755, telephone (800) 255-0461. After 
the Distribution Date, stockholders of Quest Diagnostics with inquiries 
relating to their investment in Quest Diagnostics should contact Investor 
Relations at the address and telephone number for Quest Diagnostics' 
principal executive offices indicated above and stockholders of Covance with 
inquiries relating to their investment in Covance should contact Investor 
Relations at the address and telephone number for Covance's principal 
executive offices indicated above. 

   No action is required by Corning shareholders in order to receive the 
Quest Diagnostics Common Stock or the Covance Common Stock to which they are 
entitled in the Distributions. 

                                      18 
<PAGE> 

                                   CORNING 

   Corning traces its origins to a glass business established in 1851. The 
present corporation was incorporated in the State of New York in December 
1936, and its name was changed from Corning Glass Works to Corning 
Incorporated on April 28, 1989. 

   Corning is an international corporation competing, prior to the 
Distributions, in four broadly based business segments: Specialty Materials, 
Communications, Health Care Services and Consumer Products. After the 
Distributions, Corning will compete in the Specialty Materials, 
Communications and Consumer Products business segments. Corning's total 
revenues from continuing operations were $3.3 billion in 1995. 

   The Specialty Materials segment includes the environmental-products 
business, which produces emission- control substrates and related 
applications for both the North American and European markets, and the 
science- products business, which produces various plastic and glass 
laboratory products for the life-sciences market. The other businesses which 
operate in this segment specialize in the production of optical, lighting and 
other advanced material products. 

   The Communications segment includes the opto-electronics and 
information-display businesses. The opto- electronics business produces 
optical fiber, optical cable and optical hardware and components for the 
worldwide telecommunications industry. The information-display business 
manufactures glass panels and funnels, projection video lens assemblies and 
liquid crystal display glass for flat panel displays. 

   The Consumer Products segment produces cookware, glassware and dinnerware 
that is sold primarily in the North American retail market through 
mass-market and other distribution channels. The Consumer Products segment 
also includes Steuben crystal. 

   Corning and its subsidiaries produce approximately 60,000 different 
products at 42 plants in ten countries. 

                                      19 
<PAGE> 

               SELECTED CONSOLIDATED FINANCIAL DATA OF CORNING 

   The following table summarizes certain historical consolidated financial 
data of Corning at the dates and for each of the periods indicated. The 
selected financial data as of and for the five years ended December 31, 1995 
have been derived from audited financial statements and have been restated to 
reflect Quest Diagnostics and Covance as discontinued operations. The 
selected consolidated financial data as of and for the nine months ended 
September 30, 1996 and forty weeks ended October 8, 1995 are derived from 
Corning's unaudited financial statements. In the opinion of Corning 
management, the unaudited consolidated financial statements include all 
adjustments, consisting of only normal recurring adjustments, that are 
necessary for a fair presentation of the financial position and results of 
operations for these periods. The unaudited interim results of operations for 
the nine months ended September 30, 1996 are not necessarily indicative of 
the results for the entire year ending December 31, 1996. 

                                      20 
<PAGE> 

<TABLE>
<CAPTION>
                          
                         Nine Months       Forty                                 Fiscal Year Ended 
                            Ended       Weeks Ended    ---------------------------------------------------------------------- 
                        September 30,    October 8,    December 31,   January 1,   January 2,    January 3,    December 29, 
                           1996(a)          1995           1995          1995         1994          1993           1991 
                       --------------  -------------  -------------  -----------  -----------  -------------  -------------- 
                                                      (in millions, except per share amounts) 
<S>                    <C>             <C>            <C>            <C>          <C>          <C>            <C>
Income Statement Data: 
Revenues: 
 Net sales               $   2,661.5     $  2,442.6    $   3,257.1    $  3,083.4   $  2,685.3     $2,558.9      $   2,374.9 
 Royalty, interest, and 
  dividend income               24.0           22.9           30.6          26.5         28.2         34.1             25.8 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
                             2,685.5        2,465.5        3,287.7       3,109.9      2,713.5      2,593.0          2,400.7 
Deductions: 
 Cost of sales               1,636.9        1,512.2        2,032.6       1,950.0      1,784.8      1,676.8          1,555.1 
 Selling, general and 
administrative 
  expenses                     470.1          413.8          556.2         535.8        480.3        483.3            462.5 
 Research and 
  development expenses         137.5          130.4          175.7         176.6        172.7         150.9           130.2 
 Provision for 
  restructuring and 
  other special charges                        26.5           26.5                      112.0          63.3 
Interest expense                53.8           52.8           69.3          65.6         57.5          46.8            46.9 
Other, net                      19.7           17.7           21.3          38.1         31.9          15.7            23.5 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
Income from continuing 
  operations before 
  taxes on income              367.5          312.1          406.1         343.8         74.3         156.2           182.5 
Taxes on income from 
  continuing operations        123.1           92.9          118.2         112.6         (5.2)         20.8            52.2 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
Income from continuing 
  operations before 
  minority interest and 
  equity earnings              244.4          219.2          287.9         231.2         79.5         135.4           130.3 
Minority interest in 
  earnings of 
  subsidiaries                 (41.0)         (51.4)         (64.4)        (48.6)       (15.1)        (21.0)          (16.9) 
Dividends on 
  convertible preferred 
  securities of 
  subsidiary                   (10.3)         (10.5)         (13.7)         (6.1) 
Equity in earnings 
  (losses) of associated 
  companies: 
 Other than Dow Corning 
  Corporation                   58.5           48.9           66.7          48.6         25.0          40.4            36.6 
 Dow Corning 
  Corporation                               (348.0)         (348.0)         (2.8)      (144.5)         11.9            74.4 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
Income (Loss) from 
  Continuing Operations 
  Before Extraordinary 
  Credit and 
  Cumulative Effect of 
  Changes in 
  Accounting Methods           251.6        (141.8)(c)       (71.5)(c)     222.3(e)     (55.1)(g)     166.7(i)        224.4(l) 
   
Tax benefit of loss 
  carryforwards                                                                                         0.7             5.6 
Cumulative effect of 
  changes in accounting 
  methods                                                                                            (284.7)(j) 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
Income (loss) from 
  continuing operations        251.6        (141.8)          (71.5)        222.3        (55.1)       (117.3)          230.0 
Income (loss) from 
  discontinued 
  operations, net of 
  income taxes                (162.6)(b)       7.5(d)         20.7(d)       59.0(f)      39.9(h)      104.7(k)         86.8(m) 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
Net Income (Loss)        $      89.0     $  (134.3)    $     (50.8)   $    281.3   $    (15.2)     $  (12.6)     $     316.8 
                         ==============  =============  =============   ==========   ==========  =============  ============== 
Per Common Share Data: 
Income (Loss) from 
  Continuing Operations 
  Before Extraordinary 
  Credit and 
  Cumulative Effect of 
  Changes in 
  Accounting Methods     $      1.10     $   (0.63)    $     (0.32)   $     1.04   $    (0.30)    $    0.87      $      1.19 
Tax benefit of loss 
  carryforwards                                                                                                         0.03 
Cumulative effect of 
  changes in accounting 
  methods                                                                                             (1.51) 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
Income (loss) from 
  continuing operations         1.10         (0.63)          (0.32)         1.04        (0.30)        (0.64)            1.22 
Income (loss) from 
  discontinued 
  operations, net of 
  income taxes                 (0.72)          0.03           0.09          0.28         0.21          0.56             0.47 
                         --------------  -------------  -------------   ----------   ----------  -------------  -------------- 
Net Income (Loss)        $      0.38     $    (0.60)   $     (0.23)   $     1.32   $    (0.09)    $   (0.08)     $      1.69 
                         ==============  =============  =============   ==========   ==========  =============  ============== 
Weighted Average Shares 
  Outstanding                  227.4          226.5          226.6         211.8        192.0         188.6            186.5 
                         ==============  =============  =============   ==========   ==========  =============  ============== 
Common Dividends 
  Declared               $      0.54     $     0.54    $      0.72    $     0.69   $     0.68     $    0.62      $      0.68(n) 
                         ==============  =============  =============   ==========   ==========  =============  ============== 
Balance Sheet Data (at 
  end of period): 
 Total assets            $   5,728.7     $  5,411.6    $   5,461.7    $  5,516.2   $  4,797.9     $ 4,013.3      $   3,630.6 
 Working capital               260.5          533.7          454.4         448.2        278.2         328.1            395.9 
 Loans payable beyond 
  one year                   1,278.3        1,419.2        1,340.0       1,345.0      1,550.1         781.8            669.9 
 Common stockholders' 
  equity                     2,074.3        2,081.3        2,103.0       2,263.0      1,685.8       1,803.8          2,018.8 
</TABLE>

See notes to selected consolidated financial data on following page. 

                                      21 
<PAGE> 
- ------------- 
(Footnotes for preceding page) 

(a) Effective January 1, 1996, Corning made several changes to its accounting 
    calendar which, although not affecting the comparability of Corning's 
    annual results, caused a shift in results between the quarters, primarily 
    increasing the first quarter and decreasing the third quarter reported 
    results. 

(b) The loss from discontinued operations includes a $115 million third 
    quarter after-tax charge and a $56.8 million second quarter after-tax 
    charge, offset by $9.2 million of income recognized in the first quarter. 
    The third quarter charge related primarily to a charge taken by Quest 
    Diagnostics to increase reserves related to certain government 
    investigations of billing practices of certain clinical laboratories 
    acquired by Quest Diagnostics in 1993 and 1994. The second quarter charge 
    includes the estimated costs related to the Distributions and a charge to 
    increase reserves for government claims offset by the estimated results 
    of operations of the businesses to be distributed from April 1, 1996 
    through December 31, 1996, the anticipated date of the Distributions. 

(c) In 1995, Corning recognized a restructuring charge for continuing 
    operations totalling $26.5 million ($16.1 million after tax), as a result 
    of severance for workforce reductions in certain corporate staff groups 
    and the write-off of production equipment caused by the decision to exit 
    the manufacturing facility for glass-ceramic memory-disks. 

  Corning also recorded an after-tax charge of $365.5 million to fully 
  reserve its investment in Dow Corning Corporation (a 50%-owned equity 
  company) ("Dow Corning") as a result of Dow Corning filing for protection 
  under Chapter 11 of the United States Bankruptcy Code in May 1995. Corning 
  discontinued recognition of equity earnings from Dow Corning in the second 
  quarter of 1995. 

(d) In 1995, discontinued operations included a restructuring charge 
    totalling $40.5 million ($24.4 million after tax, or $0.11 per share). 

(e) In 1994, Corning recorded a $75.9 million reduction in equity earnings as 
    a result of a charge taken by Dow Corning related to breast-implant 
    litigation. 

(f) In 1994, discontinued operations included a restructuring charge 
    totalling $82.3 million ($55.4 million after tax, or $0.26 per share). 

(g) In 1993, Corning recognized a restructuring charge from continuing 
    operations totalling $112.0 million ($63.2 million after tax and minority 
    interest) as a result of costs to integrate the Costar acquisition and a 
    planned company-wide restructuring program. Corning also recognized a 
    non-operating gain totalling $4.2 million ($2.6 million after tax). 

  Corning also recorded a $203.1 million reduction in equity earnings as a 
  result of a charge taken by Dow Corning related to breast-implant 
  litigation and a $9.5 million reduction in equity earnings as a result of a 
  restructuring charge taken by Vitro Corning, SA, then a 50%-owned equity 
  company. 

(h) In 1993, discontinued operations included restructuring and other special 
    charges totalling $95 million ($57.3 million after tax, or $0.30 per 
    share). 

(i) In 1992, Corning recorded a provision of $63.3 million ($32.1 million 
    after-tax and minority interest) as a result of Corning Vitro 
    Corporation's decision to restructure its Brazilian operations. Corning 
    also recognized net non-operating gains from consolidated operations 
    totalling $7.0 million ($21.7 million after tax), including a gain of 
    $10.1 million (before and after tax) from the sale of an additional 
    equity interest in Corning Japan and a pre-tax loss of $7.3 million ($9.0 
    million after-tax gain) from the formation of the consumer housewares 
    venture with Vitro S.A. of Mexico. 

  Corning also recognized a $37.7 million reduction in equity earnings which 
  included $24.5 million of costs associated with Dow Corning's terminated 
  breast implant business and $13.2 million of restructuring charges 
  associated with Dow Corning's exit from its Brazilian operations and other 
  cost-reduction programs. 

(j) Effective December 30, 1991, Corning and its subsidiaries adopted 
    Financial Accounting Standard No. 106, "Employers' Accounting for 
    Postretirement Benefits Other than Pensions" ("FAS 106"). The cumulative 
    effect of adopting FAS 106 resulted in a charge to continuing operations 
    of $292.9 million (after-tax and minority interest), or $1.55 per share, 
    in 1992. In addition, an $8.2 million gain, or $0.04 per share, from an 
    equity company's adoption of Financial Accounting Standard No. 109, 
    "Accounting for Income Taxes" ("FAS 109") was recognized in 1992. 

(k) In 1992, discontinued operations included a charge for the cumulative 
    effect of adopting FAS 106 totalling $1.9 million after tax, or $0.01 per 
    share and a tax benefit of loss carryforwards totalling $7.0 million, or 
    $0.04 per share. 
                                      22 
<PAGE> 

(l) In 1991, Corning recognized net non-operating gains from consolidated 
    operations totalling $4.6 million ($12.5 million after tax) which 
    included a gain of $5.3 million (before and after tax) on the sale of a 
    less than 10% equity interest in Corning Japan. Corning also recognized 
    an $8.2 million reduction in equity earnings to reflect a charge recorded 
    by Dow Corning for costs associated with its breast implant business. 

(m) In 1991, discontinued operations included non-operating gains of $3.5 
    million ($2.1 million after tax, or $0.01 per share). 

(n) Includes a special dividend of $0.15 per common share in 1991. 

(o) The following analysis summarizes the impact of the items included in 
    notes (b) through (m) on Corning's net income and earnings per share: 

<TABLE>
<CAPTION>
                          
                         Nine Months       Forty                               Fiscal Year Ended 
                            Ended       Weeks Ended   ------------------------------------------------------------------- 
                        September 30,    October 8,    December 31,   January 1,   January 2,   January 3,   December 29, 
                            1996            1995           1995          1995         1994         1993          1991 
                       --------------  -------------  -------------  -----------  -----------  -----------  -------------- 
<S>                        <C>             <C>            <C>            <C>          <C>          <C>          <C>
Net Income 
Before Unusual Items 
  and Dow Corning 
  Corporation              $ 251.6         $ 222.3        $ 292.6       $225.1       $ 159.5     $ 165.2        $137.5 
Unusual Items and Dow 
  Corning Corporation: 
  Tax benefit of loss 
   carryforwards                                                                                     0.7           5.6 
  Cumulative effect of 
   changes in 
   accounting methods                                                                             (284.7) 
  Dow Corning 
   Corporation                              (348.0)        (348.0)        (2.8)       (144.5)       11.9          74.4 
  Restructuring and 
   other special 
   charges, net of 
   non-operating gains                       (16.1)         (16.1)                     (70.1)      (10.4)         12.5 
                         --------------  -------------  -------------   ----------   ----------   ----------  -------------- 
Continuing operations        251.6          (141.8)         (71.5)       222.3         (55.1)     (117.3)        230.0 
Discontinued operations     (162.6)            7.5           20.7         59.0          39.9       104.7          86.8 
                         --------------  -------------  -------------   ----------   ----------   ----------  -------------- 
Net Income (Loss)          $  89.0         $(134.3)       $ (50.8)      $281.3       $ (15.2)    $ (12.6)       $316.8 
                         ==============  =============  =============   ==========   ==========   ==========  ============== 
Earnings Per Share 
Before Unusual Items 
  and Dow Corning 
  Corporation              $  1.10         $  0.98        $  1.29       $ 1.05       $  0.82     $  0.87        $ 0.72 
Unusual items and Dow 
  Corning Corporation: 
  Tax benefit of loss 
   carryforwards 
  Cumulative effect of 
    changes in 
    accounting methods                                                                             (1.51)         0.03 
  Dow Corning 
   Corporation                               (1.54)         (1.54)       (0.01)        (0.76)       0.06          0.40 
  Restructuring and 
   other special 
   charges, net of 
   non-operating gains                       (0.07)         (0.07)                     (0.36)      (0.06)         0.07 
                         --------------  -------------  -------------   ----------   ----------   ----------  -------------- 
Continuing operations         1.10           (0.63)         (0.32)        1.04         (0.30)      (0.64)         1.22 
Discontinued operations      (0.72)           0.03           0.09         0.28          0.21        0.56          0.47 
                         --------------  -------------  -------------   ----------   ----------   ----------  -------------- 
Net Income (Loss)          $  0.38         $ (0.60)       $ (0.23)      $ 1.32       $ (0.09)    $ (0.08)       $ 1.69 
                         ==============  =============  =============   ==========   ==========   ==========  ============== 
</TABLE>

                                      23 
<PAGE> 

                          CAPITALIZATION OF CORNING 

   The following table sets forth the actual capitalization of Corning at 
September 30, 1996, without giving effect to the Distributions. 

<TABLE>
<CAPTION>
                                                                  September 
          (dollars in millions, except per share data)            30, 1996 
                                                                 ------------ 
                                                                 (unaudited) 
<S>                                                              <C>
Short-Term Debt                                                   $  427.8 
                                                                 ============ 
Long-Term Debt                                                    $1,278.3 
                                                                 ------------ 
Convertible Preferred Securities of Subsidiary                       365.0 
                                                                 ------------ 
Convertible Preferred Stock: 
 Par value $100 per share: 10,000,000 shares 
   authorized; 227,000 shares of 8% Series B 
   Preferred Stock outstanding                                        22.7 
                                                                 ------------ 
Common Stockholders' Equity: 
 Common Stock, including excess over par value 
   and other capital, par value $0.50 per share; 
   shares authorized 500,000,000; shares issued 
   259,600,000                                                     1,174.4 
 Retained earnings                                                 1,452.3 
 Less cost of 29,900,000 shares of common stock in treasury         (603.1) 
 Cumulative translation adjustment                                    50.7 
                                                                 ------------ 
  Total common stockholders' equity                                2,074.3 
                                                                 ------------ 
   Total capitalization                                           $3,740.3 
                                                                 ============ 
</TABLE>

   Corning's investment in equity and intercompany debt of Quest Diagnostics 
and Covance totalled $1.6 billion at September 30, 1996 and is expected to 
increase to $1.8 billion at the date of the Distributions. Prior to the 
Distributions, Quest Diagnostics and Covance will borrow approximately $600 
million from third-party lenders and repay intercompany debt to Corning, 
reducing Corning's investment to approximately $1.2 billion. Corning's 
stockholders' equity will be reduced by Corning's investment in Quest 
Diagnostics and Covance at the Distribution Date. Corning intends to use the 
proceeds from the repayment of intercompany debt to repay third-party debt 
and invest for future strategic uses. 

   Corning's long-term debt as a percentage of total capital is expected to 
increase from the current 32 percent to between 40 percent and 44 percent at 
the end of 1996 when the Distributions are completed. 

                                      24 
<PAGE> 

                              THE DISTRIBUTIONS 

Reasons for the Distributions 

   Management of Corning, Quest Diagnostics and Covance each believe that 
their respective companies will be more competitive and operate more 
successfully as stand-alone entities. In particular, the separation will (i) 
permit the management of each company to concentrate on its core business, 
each business having different priorities, business strategies, operations, 
risks, services, regulatory constraints and customer demands. Corning, Quest 
Diagnostics and Covance are in substantially different businesses, each of 
which requires separate management expertise, demands distinct operational 
skills and presents different risk profiles and opportunities, and (ii) 
enable each of Quest Diagnostics and Covance to use several different 
employee stock ownership plans, available only to publicly traded companies, 
to compensate and motivate their employees through a direct link between 
equity-based awards and the performance of the particular employer. These 
different businesses compete for the attention of management, compete for 
capital with one another and have distinct levels of research and development 
requirements. The management of each has concluded that separation would 
enable each company to pursue its own business and growth strategies, as well 
as manage its own risks, without competing against each other with different 
priorities within the Corning group of companies. 

Manner of Effecting the Distributions 

   
   The Distributions were formally declared by the Corning Board on November 
20, 1996 and will be effective on the Distribution Date. At the time of the 
Distributions, share certificates for Quest Diagnostics Common Stock and 
Covance Common Stock will be delivered to the Distribution Agent. As soon as 
possible after the Distribution Date, the Distribution Agent will mail share 
certificates representing shares of Quest Diagnostics Common Stock and 
Covance Common Stock to holders of Corning Common Stock as of 11:59 p.m. on 
December 31, 1996, the date selected by the Corning Board and by Quest 
Diagnostics as the Record Date on the basis of one share of Quest Diagnostics 
Common Stock for every eight shares of Corning Common Stock and one share of 
Covance Common Stock for every four shares of Corning Common Stock (or two 
shares of Covance Common Stock for every share of Quest Diagnostics Common 
Stock) held on the Record Date. Based on 229,723,000 shares of Corning Common 
Stock outstanding on October 11, 1996, and subject to adjustment for 
repurchases of Corning Common Stock and for cancellations, waivers or other 
adjustments under certain Corning employee benefit programs of shares of 
Corning Common Stock, approximately (i) 28.0 million shares of Quest 
Diagnostics Common Stock, and (ii) 56.0 million shares of Covance Common 
Stock will be distributed. All such shares of Quest Diagnostics Common Stock 
and Covance Common Stock will be fully paid and nonassessable. See 
"Description of Quest Diagnostics Capital Stock" and "Description of Covance 
Capital Stock." 
    

   No certificates or scrip representing fractional shares of Quest 
Diagnostics Common Stock or Covance Common Stock will be issued to Corning 
shareholders as part of the Distributions. The Distribution Agent will 
aggregate fractional shares into whole shares and sell them in the open 
market at then prevailing prices on behalf of holders who otherwise would be 
entitled to receive fractional share interests, and such persons will receive 
instead a check in payment for the amount of their allocable share of the 
sale proceeds net of all brokerage charges, commissions and transfer taxes 
attributed to such sales. See "--Certain Federal Income Tax Consequences of 
the Distributions." Such sales and the distribution of the proceeds therefrom 
are expected to be made as soon as practicable after the mailing of 
certificates representing shares of Quest Diagnostics Common Stock and 
Covance Common Stock to Corning shareholders. 

   Holders of shares of Corning Common Stock issued under certain employee 
benefit programs will not receive shares of Quest Diagnostics Common Stock or 
Covance Common Stock in the Distributions. The trustee of one program has 
agreed to waive the right to receive shares of Quest Diagnostics Common Stock 
and Covance Common Stock in the Distributions and has elected instead to 
receive shares of Corning Common Stock. Pursuant to another program, holders 
will not participate in the Distributions and will receive shares of Corning 
Common Stock equivalent in value to the shares of Quest Diagnostics Common 
Stock and Covance Common Stock to be distributed. No vote of Corning 
shareholders is required in connection with the Distributions, and Corning 
shareholders have no appraisal rights in connection with the Distributions. 
No consideration will be paid by Corning shareholders for shares received in 
the Distributions nor will such shareholders be required to surrender or 
exchange shares of Corning Common Stock. Holders of Corning Common Stock will 
continue to own their shares of Corning Common 

                                      25 
<PAGE> 

Stock and, except as described above, if such shareholders were shareholders 
of record on the Record Date, they will also receive shares of Quest 
Diagnostics Common Stock and Covance Common Stock. Except for the change in 
number of shares of Corning Common Stock described above, the Distributions 
will not otherwise change the number of, or affect the rights associated 
with, outstanding shares of Corning Common Stock. 

Listing and Trading of Quest Diagnostics Common Stock and Covance Common 
Stock 

   Prior to the Distributions, there have been no public trading markets for 
the Quest Diagnostics Common Stock or the Covance Common Stock, although 
"when issued" markets are expected to develop prior to the Distribution Date. 
Application has been made to list the Quest Diagnostics Common Stock and the 
Covance Common Stock on the NYSE, subject to official notice of the 
Distributions. Prices at which Quest Diagnostics Common Stock or Covance 
Common Stock may trade prior to the Distributions on a "when-issued" basis or 
after the Distributions cannot be predicted. Until shares of the Quest 
Diagnostics Common Stock and Covance Common Stock are fully distributed and 
orderly markets develop, the prices at which trading in such stock occurs may 
fluctuate significantly. The prices at which Quest Diagnostics Common Stock 
and Covance Common Stock will trade will be determined by the marketplace and 
may be influenced by many factors, including, among others, the depth and 
liquidity of the markets for Quest Diagnostics Common Stock and Covance 
Common Stock, investor perceptions of each of Quest Diagnostics and Covance 
and the clinical laboratory testing and contract research businesses, as the 
case may be, and general economic and market conditions. 

   
   Upon the consummation of the Distributions, Corning Clinical Laboratories 
Inc. will adopt the name Quest Diagnostics Incorporated. Application has been 
made to list the Quest Diagnostics Common Stock on the NYSE, subject to 
official notice of the Distributions, under the trading symbol "DGX." Quest 
Diagnostics initially will have approximately 18,000 stockholders of record, 
based on the number of holders of record of Corning Common Stock at the date 
of this Information Statement. The Transfer Agent and Registrar for the Quest 
Diagnostics Common Stock will be Harris Trust and Savings Bank. For certain 
information regarding options to purchase Quest Diagnostics Common Stock that 
may become outstanding after the Distributions, see "Management of Quest 
Diagnostics." 
    

   Application has been made to list the Covance Common Stock on the NYSE, 
subject to official notice of the Distributions, under the trading symbol 
"CVD." Covance initially will have approximately 18,000 stockholders of 
record, based on the expected number of holders of Quest Diagnostics Common 
Stock immediately following the Quest Diagnostics Spin-Off Distribution. The 
Transfer Agent and Registrar for the Covance Common Stock will be Harris 
Trust and Savings Bank. For certain information regarding options to purchase 
Covance Common Stock that may become outstanding after the Distributions, see 
"Management of Covance." 

   Shares of Quest Diagnostics Common Stock and Covance Common Stock 
distributed to Corning shareholders in the Distributions will be freely 
transferable, except for shares of Quest Diagnostics Common Stock and Covance 
Common Stock received by persons who may be deemed to be "affiliates" of 
Quest Diagnostics or Covance, respectively, under the Securities Act of 1933, 
as amended (the "Securities Act"). Persons who may be deemed to be affiliates 
of Quest Diagnostics or Covance after the Distributions generally include 
individuals or entities that control, are controlled by, or are under common 
control with, Quest Diagnostics or Covance, respectively, and may include 
certain officers and directors of Quest Diagnostics or Covance as well as 
principal stockholders of Quest Diagnostics or Covance, if any. Persons who 
are affiliates of Quest Diagnostics or Covance will be permitted to sell 
their shares of Quest Diagnostics Common Stock or Covance Common Stock, as 
the case may be, only pursuant to an effective registration statement under 
the Securities Act or an exemption from the registration requirements of the 
Securities Act, such as the exemption afforded by Section 4(1) of the 
Securities Act or by Rule 144 under the Securities Act. See "Description of 
Quest Diagnostics Capital Stock--Restrictions on Transfer" and "Description 
of Covance Capital Stock--Restrictions on Transfer." 

Certain Federal Income Tax Consequences of the Distributions 

   THE FOLLOWING IS A SUMMARY OF CERTAIN FEDERAL INCOME TAX CONSEQUENCES 
RESULTING FROM THE DISTRIBUTIONS UNDER CURRENT LAW. HOLDERS OF CORNING COMMON 
STOCK ARE URGED TO CONSULT THEIR OWN TAX ADVISORS AS TO THE PARTICULAR 
CONSEQUENCES TO THEM OF THE DISTRIBUTIONS, INCLUDING THE APPLICATION OF 
STATE, LOCAL AND FOREIGN TAX LAWS. THIS SUMMARY MAY NOT BE APPLICABLE TO 
HOLDERS WHO 

                                      26 
<PAGE> 

RECEIVED THEIR STOCK THROUGH THE EXERCISE OF OPTIONS OR OTHERWISE AS 
COMPENSATION OR WHO ARE NOT CITIZENS OR RESIDENTS OF THE UNITED STATES. 

   
   Corning has received a ruling from the Internal Revenue Service (the 
"IRS") to the effect that the Distributions will, for federal income tax 
purposes, qualify as tax-free distributions under section 355 of the Internal 
Revenue Code, as amended (the "Code"). Among other conclusions, the ruling 
from the IRS (the "IRS Ruling") holds that, for federal income tax purposes: 
    

     (1) no gain or loss will be recognized by Corning upon the Quest 
   Diagnostics Spin-Off Distribution under Code section 355(c), 

     (2) no gain or loss will be recognized by (and no amount will be 
   included in the income of) the Corning shareholders upon receipt of shares 
   of Quest Diagnostics Common Stock, except to the extent of gain 
   attributable to cash received in exchange for fractional shares, under 
   Code section 355(a), 

     (3) no gain or loss will be recognized by Quest Diagnostics upon the 
   Covance Spin-Off Distribution under Code section 355(c), 

     (4) no gain or loss will be recognized by (and no amount will be 
   included in the income of) the Quest Diagnostics stockholders upon the 
   receipt of shares of Covance Common Stock, except to the extent of gain 
   attributable to cash received in exchange for fractional shares, under 
   Code section 355(a), 

     (5) the tax basis of the Corning Common Stock and Quest Diagnostics 
   Common Stock in the hands of the Corning shareholders immediately after 
   the Quest Diagnostics Spin-Off Distribution will be the same as their 
   basis in the Corning Common Stock immediately before the Quest Diagnostics 
   Spin-Off Distribution, allocated to each in proportion to the relative 
   fair market values in accordance with Treasury Regulation section 
   1.358-2(a)(2) (Code section 358(b)(1)), 

     (6) the holding period of the shares of Quest Diagnostics Common Stock 
   received in the Quest Diagnostics Spin-Off Distribution will include the 
   holding period of the Corning Common Stock with respect to which the 
   distribution is made, provided that the Corning Common Stock is held as a 
   capital asset on the date of the Quest Diagnostics Spin-Off Distribution 
   (Code section 1223(l)), 

     (7) the tax basis of the Quest Diagnostics Common Stock and Covance 
   Common Stock in the hands of the Quest Diagnostics stockholders 
   immediately after the Covance Spin-Off Distribution will be the same as 
   their basis in the Quest Diagnostics Common Stock immediately before the 
   Covance Spin-Off Distribution (but after taking into account the Quest 
   Diagnostics Spin-Off Distribution), allocated to each in proportion to the 
   relative fair market values in accordance with Treasury Regulation section 
   1.358-2(a)(2) (Code section 358(b)(1)), and 

     (8) the holding period of the shares of Covance Common Stock received in 
   the Covance Spin-Off Distribution will include the holding period of the 
   Quest Diagnostics Common Stock with respect to which the distribution is 
   made, provided that the Quest Diagnostics Common Stock is held as a 
   capital asset on the date of the Covance Spin-Off Distribution (Code 
   section 1223(l)). 

   
   The continuing validity of the IRS Ruling is subject to certain factual 
representations and assumptions and future events. Moreover, there can be no 
assurance that events occurring subsequent to the Distributions will not 
cause the Distributions to be deemed taxable distributions. If the 
Distributions were taxable (because of noncompliance with the factual 
representations and assumptions contained in the IRS Ruling or future 
events), then corporate level income taxes would be imposed on Corning and 
Quest Diagnostics and the holders of Corning Common Stock would be treated as 
if such shareholders received a taxable distribution. The Spin-Off Tax 
Indemnification Agreements will provide (i) Corning with certain rights of 
indemnification against Quest Diagnostics and Covance and (ii) Quest 
Diagnostics and Covance with certain rights of indemnification against each 
other in respect of future events that could result in the Distributions 
being deemed taxable distributions. For a description of the Tax Sharing 
Agreement and the Spin-Off Tax Indemnification Agreements pursuant to which 
Corning, Quest Diagnostics and Covance have provided for various other tax 
matters, see "The Relationship Among Corning, Quest Diagnostics and Covance 
After the Distributions--Tax Sharing Agreement" and "The Relationship Among 
Corning, Quest Diagnostics and Covance After the Distributions--Spin-Off Tax 
Indemnification Agreements." 
    


                                      27 
<PAGE> 

   Treasury regulations require that each shareholder of Corning who receives 
shares of Quest Diagnostics Common Stock in the Quest Diagnostics Spin-Off 
Distribution and each shareholder of Quest Diagnostics who receives shares of 
Covance Common Stock in the Covance Spin-Off Distribution attach, to the 
federal income tax return of such shareholder for the tax year in which such 
stock is received, a detailed statement setting forth such data as may be 
appropriate in order to show the applicability of Code section 355 to the 
Distributions. Within a reasonable time after the Distributions, Corning will 
provide each Corning shareholder on the Record Date additional information 
concerning the allocation of tax basis referred to in (5) and (7) above and 
other appropriate information. 

Conditions; Termination 

   
   The Corning Board has reserved the right to postpone or terminate and 
abandon the Distributions at any time prior to the Distribution Date. This 
reservation has primarily been made to enable appropriate action to be taken 
if the following conditions to the Distributions contained in the Transaction 
Agreement are not fulfilled or are not expected to be fulfilled at a time 
that will allow the Distributions to be effected by December 31, 1996: (i) 
Corning shall have received a favorable IRS Ruling, (ii) the registration 
statements on Form 10 filed by each of Quest Diagnostics and Covance shall 
have been declared effective by the Securities and Exchange Commission (the 
"Commission"), (iii) the Quest Diagnostics Common Stock and the Covance 
Common Stock shall have been approved for listing on the NYSE, subject to 
official notice of the Distributions, (iv) Corning shall have received a 
favorable response from the Commission to its "no-action request" letter 
concerning, among other things, whether the Distributions may be effected 
without registration of the Quest Diagnostics Common Stock or Covance Common 
Stock under the Securities Act, (v) the Covance Credit Facility will have 
closed, (vi) the Quest Diagnostics Credit Facility will have closed and (vii) 
the Quest Diagnostics Notes Offering (as defined below) shall have been 
consummated. 
    

Repayment of Intercompany Indebtedness 

   Prior to the Distributions, each of Quest Diagnostics and Covance will 
repay certain intercompany indebtedness to Corning. Quest Diagnostics will 
repay intercompany indebtedness in an amount equal to $500 million which will 
be financed by the borrowings under the Quest Diagnostics Credit Facility and 
the proceeds realized from the Quest Diagnostics Notes Offering. Corning will 
cancel any remaining intercompany indebtedness owed to it by Quest 
Diagnostics as a contribution to the capital of Quest Diagnostics. Covance 
will repay intercompany indebtedness between $150 million and $160 million 
which will be financed by the borrowings under the Covance Credit Facility. 
At the time of the Distributions, there will be no intercompany indebtedness 
outstanding between any of Quest Diagnostics or Covance and Corning. 

Reasons for Furnishing this Information Statement 

   This Information Statement is being furnished by Corning solely to provide 
information to Corning shareholders who will receive the Quest Diagnostics 
Common Stock and the Covance Common Stock in the Distributions. It is not 
intended to be, and should not be construed as, an inducement or 
encouragement to buy or sell any securities of Corning, Quest Diagnostics or 
Covance. The information contained in this Information Statement is believed 
by Corning, Quest Diagnostics and Covance to be accurate as of the date set 
forth on its cover. Changes may occur after that date, and none of Quest 
Diagnostics, Covance or Corning will update the information except in the 
normal course of their respective public disclosure practices. 

                                      28 

<PAGE>

        THE RELATIONSHIP AMONG CORNING, QUEST DIAGNOSTICS AND COVANCE 
                           AFTER THE DISTRIBUTIONS 

   After the Distributions, Quest Diagnostics Incorporated ("Quest 
Diagnostics") and Covance Inc. ("Covance") will be independent public 
companies and Corning Incorporated ("Corning") will not have any ownership 
interest in either Quest Diagnostics or Covance other than shares of Quest 
Diagnostics' voting cumulative preferred stock. Corning, Quest Diagnostics 
and Covance will enter into certain agreements, summarized below, to provide 
for an orderly transition to the status of three separate independent 
companies, to govern their relationship subsequent to the Distributions and 
to provide for the allocation of tax and certain other liabilities and 
obligations arising from periods prior to the Distributions. Copies of the 
forms of such agreements have been filed as exhibits to the Registration 
Statements of which this Information Statement is a part. The following 
description summarizes the material terms of such agreements, but is 
qualified by reference to the texts of such agreements as filed. 

Transaction Agreement 

   Corning, Quest Diagnostics and Covance will enter into the Transaction 
Agreement (the "Transaction Agreement") providing for, among other things, 
certain conditions precedent to the Distributions, certain corporate 
transactions required to effect the Distributions and other arrangements 
between Corning, Quest Diagnostics and Covance subsequent to the 
Distributions. See "The Distributions--Conditions; Termination." 

   The Transaction Agreement will provide for, among other things, 
assumptions of liabilities and cross- indemnities designed to allocate 
generally, effective as of the Distribution Date, financial responsibility 
for the liabilities arising out of or in connection with (i) the clinical 
laboratory business to Quest Diagnostics and its subsidiaries, (ii) the 
contract research business to Covance and its subsidiaries and (iii) all 
other business conducted by Corning prior to the Distribution Date to Corning 
and its subsidiaries other than Quest Diagnostics and Covance. 

   The Transaction Agreement will provide that Corning, Quest Diagnostics and 
Covance will use their respective commercially reasonable efforts to achieve 
an allocation of consolidated indebtedness of Corning and a capital structure 
that reflects the capital structure after the Distributions of Corning, Quest 
Diagnostics and Covance as contemplated in the discussion under 
"Capitalization of Quest Diagnostics" and "Capitalization of Covance." In 
addition to the specific indemnity described below, Corning, Quest 
Diagnostics and Covance are obligated under the Transaction Agreement to 
indemnify and hold harmless each other in respect of Indemnifiable Losses (as 
defined therein) arising out of or otherwise relating to the management or 
conduct of their respective businesses or the breach of any provision of the 
Transaction Agreement; provided, however, that Quest Diagnostics will have no 
obligation to indemnify or hold harmless Corning in respect of Indemnifiable 
Losses arising out of any governmental claims or investigations described in 
the next paragraph. 

   As discussed under "Business of Quest Diagnostics--Government 
Investigations and Related Claims," Quest Diagnostics is subject to several 
governmental investigations. Any amounts paid by Quest Diagnostics to settle 
these investigations, or as a result of a judgment relating to these 
investigations, will be indemnified by Corning under the Transaction 
Agreement. Under the Transaction Agreement Corning will agree to indemnify 
Quest Diagnostics against all monetary penalties, fines or settlements 
arising out of any governmental criminal, civil or administrative 
investigations or claims that have been settled prior to or are pending as of 
the Distribution Date, pursuant to service of subpoena or other notice of 
such investigation to Quest Diagnostics, as well as any qui tam proceeding 
for which a complaint was filed prior to the Distribution Date whether or not 
Quest Diagnostics has been served with such complaint or otherwise been 
notified of the pendency of such action, to the extent that such 
investigations or claims arise out of or are related to alleged violations of 
federal fraud and health care statutes identified in the Transaction 
Agreement by reason of Quest Diagnostics or any company acquired by Quest 
Diagnostics billing any federal program or agency for services rendered to 
beneficiaries of such program or agency. Corning will also indemnify Quest 
Diagnostics for 50% of the aggregate of all judgment or settlement payments 
made by Quest Diagnostics that are in excess of $42.0 million in respect of 
claims by private parties (i.e., nongovernmental parties such as private 
insurers) that relate to indemnified or previously settled governmental 
claims and that allege overbillings by Quest Diagnostics or any existing 
subsidiaries of Quest Diagnostics for services provided prior to the 
Distribution Date; provided, however, such indemnification for private claims 
will terminate five years after the Distribution Date (whether or not 
settled) and will not exceed $25.0 million in the aggregate (reduced by 
certain tax benefits as described below). Quest Diagnostics' aggregate 
reserve with respect to all governmental and private claims, including 
litigation costs, was $215 million at September 30, 1996 and is estimated to 
be reduced to $85 million at the Distribution Date as a result of the payment 
of settled claims, primarily the Damon settlement of $119 million. 

                                      29 
<PAGE> 

   Corning will not indemnify Quest Diagnostics against any governmental 
claims that arise after the Distribution Date, even though relating to events 
prior to the Distribution Date, or to any private claims that do not relate 
to the indemnified or previously settled governmental claims or 
investigations or investigations that relate to post- Distribution Date 
billings. Corning will not indemnify Quest Diagnostics against consequential 
or incidental damages relating to the billing claims, including losses of 
revenues and profits as a consequence of any exclusion from participation in 
federal or state health care programs or the fees and expenses of the 
litigation, including attorneys' fees and expenses. All amounts indemnified 
against by Corning for the benefit of Quest Diagnostics will be calculated on 
a net after-tax basis by taking into account any deductions and other tax 
benefits realized by Quest Diagnostics (or a consolidated group of which 
Quest Diagnostics is a member after the Distributions (the "Quest Diagnostics 
Group")) in respect of the underlying settlement, judgment payment, or other 
loss (or portion thereof) indemnified against by Corning generally at the 
time and to the extent such deductions or tax benefits are deemed to reduce 
the tax liability of Quest Diagnostics or the Quest Diagnostics Group under 
the Transaction Agreement. 

   The Transaction Agreement provides that, in the case of any claims for 
which Corning, Quest Diagnostics or Covance are entitled to indemnification, 
the indemnified party will control the defense of any claim unless the 
indemnifying party elects to assume such defense. However, in the case of all 
private claims related to indemnified governmental claims related to alleged 
overbillings, Quest Diagnostics will control the defense. Disputes under the 
Transaction Agreement are subject to binding arbitration. The Transaction 
Agreement will also provide that, except as otherwise set forth therein or in 
any other agreement, all costs or expenses incurred on or prior to the 
Distribution Date in connection with the Distributions will be allocated 
among the parties. Except as set forth in the Transaction Agreement or any 
related agreement, each party shall bear its own costs and expenses incurred 
after the Distribution Date. 

Spin-Off Tax Indemnification Agreements 

   Corning and Quest Diagnostics will enter into a tax indemnification 
agreement (the "Corning/Quest Diagnostics Spin-Off Tax Indemnification 
Agreement") pursuant to which (1) Quest Diagnostics will represent to Corning 
that, to the best of its knowledge, the materials relating to Quest 
Diagnostics submitted to the Internal Revenue Service ("IRS") in connection 
with the request for ruling submitted to the IRS are complete and accurate in 
all material respects, (2) Quest Diagnostics will represent that it has no 
present intention to undertake the transactions described in part (3)(iii) 
hereafter or cease to engage in the active conduct of providing clinical 
laboratory testing services, (3) Quest Diagnostics will covenant and agree 
that for a period of two years following the Distribution Date (the 
"Restricted Period"), (i) Quest Diagnostics will continue to engage in the 
clinical laboratory testing business, (ii) Quest Diagnostics will continue to 
manage and own at least 50% of the assets which it owns directly and 
indirectly immediately after the Distribution Date and (iii) neither Quest 
Diagnostics, nor any related corporation nor any of their respective 
directors, officers or other representatives will undertake, authorize, 
approve, recommend, permit, facilitate, or enter into any contract, or 
consummate any transaction with respect to: (A) the issuance of Quest 
Diagnostics Common Stock (including options and other instruments convertible 
into Quest Diagnostics Common Stock) which would exceed fifty percent (50%) 
of the outstanding shares of Quest Diagnostics Common Stock immediately after 
the Distribution Date; (B) the issuance of any other instrument that would 
constitute equity for federal tax purposes ("Disqualified Quest Diagnostics 
Stock"); (C) the issuance of options and other instruments convertible into 
Disqualified Quest Diagnostics Stock; (D) any repurchases of Quest 
Diagnostics Common Stock, unless such repurchases satisfy certain 
requirements; (E) the dissolution, merger, or complete or partial liquidation 
of Quest Diagnostics or any announcement of such action; or (F) the waiver, 
amendment, termination or modification of any provision of the Quest 
Diagnostics Rights Plan (as defined therein) in connection with, or in order 
to permit or facilitate, any acquisition of Quest Diagnostics Common Stock or 
other equity interest in Quest Diagnostics, and (4) Quest Diagnostics will 
agree to indemnify Corning for Taxes (as defined below) arising from 
violations of (1), (2) or (3) above and for Taxes arising as a result of (A) 
an acquisition of 20% or more of the stock of Quest Diagnostics by a person 
or related persons during the Restricted Period or (B) the commencement of a 
tender or purchase offer by a third party for 20% or more of Quest 
Diagnostics stock. If obligations of Quest Diagnostics under this agreement 
were breached and as a result thereof one or both of the Distributions do not 
qualify for the treatment stated in the ruling Corning requested from the IRS 
(the "IRS Ruling"), Quest Diagnostics would be required to indemnify Corning 
for Taxes imposed and such indemnification obligations could exceed the net 
asset value of Quest Diagnostics at such time. 

   Corning and Covance will enter into a tax indemnification agreement (the 
"Corning/Covance Spin-Off Tax Indemnification Agreement") pursuant to which 
(1) Covance will represent to Corning that to the best of its knowledge, 

                                      30 
<PAGE> 

the materials relating to Covance submitted to the IRS in connection with the 
request for ruling submitted to the IRS are complete and accurate in all 
material respects, (2) Covance will represent that it has no present 
intention to undertake the transactions described in part (3)(iii) hereafter 
or to cease to engage in the active conduct of providing contract research 
services, (3) Covance will covenant and agree that during the Restricted 
Period, (i) Covance will continue to engage in the contract research 
business, (ii) Covance will continue to manage and own at least 50% of the 
assets which it owns directly and indirectly immediately after the 
Distribution Date and (iii) neither Covance, nor any related corporations nor 
any of their respective directors, officers or other representatives will 
undertake, authorize, approve, recommend, permit, facilitate, or enter into 
any contract, or consummate any transaction with respect to: (A) the issuance 
of Covance Common Stock (including options and other instruments convertible 
into Covance Common Stock) which would exceed fifty percent (50%) of the 
outstanding shares of Covance Common Stock immediately after the Distribution 
Date; (B) the issuance of any other instrument that would constitute equity 
for federal tax purposes ("Disqualified Covance Stock"); (C) the issuance of 
options and other instruments convertible into Disqualified Covance Stock; 
(D) any repurchases of Covance Common Stock, unless such repurchases satisfy 
certain requirements; (E) the dissolution, merger, or complete or partial 
liquidation of Covance or any announcement of such action; or (F) the waiver, 
amendment, termination or modification of any provision of the Covance Rights 
Plan (as defined therein) in connection with, or in order to permit or 
facilitate, any acquisition of Covance Common Stock or other equity interest 
in Covance and (4) Covance will agree to indemnify Corning for Taxes arising 
from violations of (1), (2) or (3) above and for Taxes arising as a result of 
(A) an acquisition of 20% or more of the stock of Covance by a person or 
related persons during the Restricted Period or (B) the commencement of a 
tender or purchase offer by a third party for 20% or more of Covance stock. 
If obligations of Covance under this agreement were breached and as a result 
thereof one or both of the Distributions do not qualify for the treatment 
stated in the IRS Ruling, Covance would be required to indemnify Corning for 
Taxes imposed and such indemnification obligations could exceed the net asset 
value of Covance at such time. 

   Quest Diagnostics and Covance will enter into a tax indemnification 
agreement (the "Quest Diagnostics/ Covance Spin-Off Tax Indemnification 
Agreement") which will be essentially the same as the Corning/Covance 
Spin-Off Tax Indemnification Agreement except that Covance will make 
representations to and indemnify Quest Diagnostics as opposed to Corning. If 
obligations of Covance under this agreement were breached and as a result 
thereof one or both of the Distributions do not qualify for the treatment 
stated in the IRS Ruling, Covance would be required to indemnify Quest 
Diagnostics for Taxes imposed and such indemnification obligations could 
exceed the net asset value of Covance at such time. Quest Diagnostics and 
Covance will enter into a second tax indemnification agreement (the 
"Covance/Quest Diagnostics Spin-Off Tax Indemnification Agreement") which 
will be essentially the same as the Corning/Quest Diagnostics Spin-Off Tax 
Indemnification Agreement except that Quest Diagnostics will make 
representations to and indemnify Covance as opposed to Corning. If 
obligations of Quest Diagnostics under this agreement were breached and as a 
result thereof one or both of the Distributions do not qualify for the 
treatment stated in the IRS Ruling, Quest Diagnostics would be required to 
indemnify Covance for Taxes imposed and such indemnification obligations 
could exceed the net asset value of Quest Diagnostics at such time. 

   The Spin-Off Tax Indemnification Agreements will also require (i) Quest 
Diagnostics to take such actions as Corning may reasonably request and (ii) 
Covance to take such actions as Corning and Quest Diagnostics may reasonably 
request to preserve the favorable tax treatment provided for in any rulings 
obtained from the IRS in respect of the Distributions. 

Tax Sharing Agreement 

   Corning, Quest Diagnostics and Covance will enter into a tax sharing 
agreement (the "Tax Sharing Agreement") which will allocate responsibility 
for federal income and various other taxes ("Taxes") among the three 
companies. The Tax Sharing Agreement provides that, except for Taxes arising 
as a result of the failure of either or both of the Distributions to qualify 
for the treatment stated in the IRS Ruling (which Taxes are allocated either 
pursuant to the Spin-Off Tax Indemnification Agreements or as described 
below), Corning is liable for and will pay the federal income taxes of the 
consolidated group that includes Quest Diagnostics and Covance and their 
subsidiaries, provided, however, that Quest Diagnostics and Covance are 
required to reimburse Corning for taxes for periods beginning after December 
31, 1995 in which they are members of the Corning consolidated group and for 
which tax returns have not been filed as of the Distribution Date. This 
reimbursement obligation is based on the hypothetical separate federal tax 
liability of Quest Diagnostics and Covance, including their respective 
subsidiaries, calculated on a separate consolidated basis, subject to certain 
adjustments. Under the Tax Sharing Agreement, in the case of adjustments by a 
taxing authority of a 

                                      31 
<PAGE> 

consolidated federal income tax or certain other tax returns prepared by 
Corning which includes Quest Diagnostics or Covance, then, subject to certain 
exceptions, Corning is liable for and will pay any tax assessments, and is 
entitled to any tax refunds, resulting from such audit. 

   The Tax Sharing Agreement further provides that, if either of the 
Distributions fails to qualify for the tax treatment stated in the IRS Ruling 
(for reasons other than those indemnified against under one or more of the 
Spin-Off Tax Indemnification Agreements), Taxes imposed upon or incurred by 
Corning, Quest Diagnostics or Covance as a result of such failure are to be 
allocated among Corning, Quest Diagnostics and Covance in such a manner as 
will take into account the extent to which the actions or inactions of each 
may have contributed to such failure, and Corning, Quest Diagnostics and 
Covance each will indemnify and hold harmless the other from and against the 
taxes so allocated. If it is determined that none of the companies 
contributed to the failure of such distribution to qualify for the tax 
treatment stated in the IRS Ruling, the liability for taxes will be borne by 
each in proportion to its relative average market capitalization as 
determined by the average closing price for the common stock of each during 
the 20 trading-day period immediately following the Distribution Date. In the 
event that either of the Distributions fails to qualify for the tax treatment 
stated in the IRS Ruling and the liability for taxes as a result of such 
failure is allocated among Corning, Quest Diagnostics and Covance, the 
liability so allocated to Quest Diagnostics or Covance could exceed the net 
asset value of Quest Diagnostics or Covance, respectively. 

Voting Cumulative Preferred Stock of Quest Diagnostics 

   After the Distributions, Corning will retain 1,000 shares of Quest 
Diagnostics' voting cumulative preferred stock, with an aggregate liquidation 
preference of $1.0 million. Corning is the sole holder of such shares. For a 
description of the terms of the Quest Diagnostics voting cumulative preferred 
stock, see "Description of Quest Diagnostics Capital Stock--Voting Cumulative 
Preferred Stock." 

                                      32 


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