How are U.S. patents and patent application publications coded according to WIPO standards?
According to MPEP 1851, U.S. patents and patent application publications are coded as follows: U.S. patents published before January 2, 2001: Code A documents U.S. patents published on or after January 2, 2001: Code B documents Patent Application Publications (first published on March 15, 2001): Code A documents Reexamination certificates published before January 2, 2001:…
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