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Halliburton Oil Well Cementing Co. v. Walker

146 F.2d 817, 64 U.S.P.Q. 278 (1944)

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Halliburton Oil Well Cementing Co. v. Walker

United States Court of Appeals for the Ninth Circuit
146 F.2d 817, 64 U.S.P.Q. 278 (1944)

Facts

Cranford Walker (plaintiff) sued Halliburton Oil Well Cementing Company (defendant) for infringement of three patents in federal district court. The court held that two of Walker’s patents were infringed but that the third (the ‘944 patent) was invalid for lack of invention. The ‘944 patent claimed a method for determining the distance between a well head and the fluid surface beneath through the use of an equation involving the length of echoes. The case was appealed to the United States Court of Appeals for the Ninth Circuit.

Rule of Law

Issue

Holding and Reasoning (Healy, J.)

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