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E. I. DUPONT de NEMOURS v. DIAMOND SHAMROCK CORP.

Civ. A. No. 80-137.

522 F.Supp. 588 (1981)

E. I. DUPONT de NEMOURS AND COMPANY, Plaintiff, v. DIAMOND SHAMROCK CORPORATION, Defendant.

United States District Court, D. Delaware.

September 16, 1981.

Attorney(s) appearing for the Case

Richard D. Allen, Morris, Nichols, Arsht & Tunnell, Wilmington, Del., John O. Tramontine, David J. Lee, Fish & Neave, New York City, for plaintiff.

C. Waggaman Berl, Jr., Wilmington, Del., John D. Foley, William S. Feiler, Israel Blum, Joseph A. Calvaruso, Morgan, Finnegan, Pine, Foley & Lee, New York City, for defendant.

OPINION

STAPLETON, District Judge:

DuPont filed this action in the District of Delaware on March 27, 1980, seeking a declaration of the invalidity of United States Patent No. 4,192,725, issued to Ronald Dotson and Kevin J. O'Leary and assigned to Diamond Shamrock ("the Dotson '725 patent"). The Dotson '725 patent claims a process for producing chlorine and sodium hydroxide (lime) by the electrolysis of a solution of water and ordinary salt (sodium

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