What is the effective date for prior art under AIA 35 U.S.C. 102(a)(2)?
This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.
Under AIA 35 U.S.C. 102(a)(2), the effective date for prior art is the date the patent document was effectively filed. The MPEP states: “AIA 35 U.S.C. 102(a)(2) sets forth three types of U.S. patent documents that are available as prior art as of the date they were effectively filed with respect to the subject matter relied upon in the document if they name another inventor.“
This means that the prior art date is not necessarily the publication date or the actual filing date, but rather the earliest date to which the patent document is entitled to claim priority. This could include priority claims to earlier filed provisional applications or foreign applications.