Yes, even a single sale or offer to sell can trigger the on-sale bar under 35 U.S.C. 102(b). The MPEP explicitly states: Even a single sale or offer to sell the invention may bar patentability under pre-AIA 35 U.S.C. 102(b). (MPEP 2133.03(b)) This principle is supported by case law, including Consolidated Fruit-Jar Co. v. Wright…

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