Conception Date

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Federal Circuit Says Secret Prior Art Is Prior Art for All Purposes

In Tyco Healthcare Group LP v. Ethicon Endo-Surgery, Inc., the Federal Circuit agreed with the district court that Ethicon’s prototype constituted prior art under 35 USC § 102(g) based on its earlier date of conception, but...more

Pinpointing Invention Conception Date in a Patent Interference

In Dawson v. Dawson, the Federal Circuit considered an unusual case with a question that often arises in interferences: when did the inventor invent the subject matter at issue. While the decision does not break new ground in...more

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