On sale

An invention is on sale within the meaning of U.S. patent law where the subject matter of the sale, or offer to sell fully anticipated the claimed invention or would have rendered the claimed invention obvious by its addition to the prior art. The on sale bar of 35 U.S.C. §102(b) is triggered if the invention is both (1) the subject of a commercial offer for sale not primarily for experimental purposes and (2) ready for patenting. Traditional contract law principles are applied when determining whether a commercial offer for sale has occurred.