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BRISTOL LOCKNUT CO. v. SPS TECHNOLOGIES, INC.

CA Nos. 80-5234, 80-5236, 80-5240 and 80-5241.

677 F.2d 1277 (1982)

BRISTOL LOCKNUT COMPANY, Plaintiff/Appellee/Cross-Appellant, v. SPS TECHNOLOGIES, INC., Defendant/Appellant/Cross-Appellee.

United States Court of Appeals, Ninth Circuit.

Decided May 24, 1982.

Rehearing Denied June 28, 1982.

Attorney(s) appearing for the Case

John W. Logan, Jr., Ferrill & Logan, Fort Washington, Pa., for SPS Technologies, Inc.

R. Douglas Lyon, Lyon & Lyon, Los Angeles, Cal., for Bristol Locknut Co.

Before HUG, TANG, and FARRIS, Circuit Judges.

FARRIS, Circuit Judge:

BACKGROUND

The validity and infringement of two patents and a trademark held by SPS Technologies, Inc. are at issue. The Skidmore Patent No. 3,208,494 claims and describes what is known in the industry as a prevailing torque locknut.1 A locknut differs from a free spinning nut in that it requires greater effort to remove it from a bolt. Because locknuts will not vibrate loose, they are widely used in the...

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