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DANA CORP. v. NOK, INC.

No. 88-1461.

882 F.2d 505 (1989)

DANA CORPORATION, Plaintiff/Appellee, v. NOK, INC., Defendant/Appellant.

United States Court of Appeals, Federal Circuit.

August 14, 1989.

Attorney(s) appearing for the Case

Ernie L. Brooks, of Brooks & Kushman, Southfield, Michigan, argued for plaintiff/appellee. With him on the brief was Kevin J. Heini.

Owen E. Perry, of Reising, Ethington, Barnard, Perry & Milton, Troy, Mich., argued for defendant/appellant. With him on the brief was Jeanne-Marie Buiteweg.

Before ARCHER, MAYER and MICHEL, Circuit Judges.

ARCHER, Circuit Judge.

NOK, Inc. (NOK) appeals from the judgment of the United States District Court for the Eastern District of Michigan holding that U.S. Patent 3,498,621 is not invalid or unenforceable and is infringed. Dana Corp. v. NOK, Inc., 7 USPQ2d 1827 (S.D.Mich.1988). We reverse the district court's validity determination and remand for further proceedings.

Background

The '621 patent, entitled "Valve Stem Seal," issued to R.R. Wilson...

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