bar date

bar date. Patents. The date by which a U.S. patent application must be filed to avoid losing the right to receive a patent. • In the U.S., the bar date for a patent application is one year after the invention is disclosed in a publication or patented in another country, or put into public use, sold, or offered for sale in the U.S. (since the invention was offered for domestic sale on January 1, 2000, the bar date for the U.S. patent application is January 1, 2001). Cf. absolute novelty under NOVELTY. [Cases: Patents 67.

1. C.J.S. Patents § 52.]

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