MPEP Section 1920, Citation of Prior Art Under 37 CFR 1.501(a)
Executive summary:
This document contains Section 1920 ("Citation of Prior Art Under 37 CFR 1.501(a)") of the Manual of Patent Examining Procedure (the "M.P.E.P."), Eighth Edition, Eighth Revision (July 2010). This page was last updated in January 2011. You may return to the section index to find a particular section. Alternatively, you may search the MPEP using the search box that appears on the left side of every page of BitLaw--you may restrict your search to the MPEP on the search results page.
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1920 Citation of Prior Art Under 37 CFR 1.501(a)
37 CFR 1.501(a) permits any person at any time during the period of enforceability of a patent to cite to the Office, in writing, prior art consisting of patent and printed publications which that person states to be pertinent and applicable to the patent and believes to have a bearing on the patentability of any claim(s) of the patent. See MPEP § 2202 - § 2208.