Rosaire v. Baroid Sales Division
United States Court of Appeals for the Fifth Circuit
218 F.2d 72 (5th Cir. 1955)
Rosaire and Horvitz (plaintiff) obtained patents on a soil-sampling method of oil prospecting, claiming they discovered it in 1936. Baroid Sales Division (defendant) argued the patents were invalid because Gulf Oil employee Abraham Teplitz had already discovered and extensively field-tested the same method between 1935 and 1936, before Gulf suspended its prospecting program to review the data. Rosaire conceded Teplitz went first but argued that, because Gulf never patented, published, or publicized the method, Teplitz's work was just an abandoned, incomplete experiment that shouldn't count against Rosaire's later patent. The trial court held Rosaire's patents invalid, and Rosaire appealed.
Whether a prior experiment that successfully establishes the practicability of an invention or discovery can negate the novelty of a later, similar invention or discovery.