What are the kind codes for U.S. patent publications?
U.S. patent publications use specific kind codes to indicate the type and status of a document. According to MPEP 901.04(a): A1: Patent Application Publication A2: Republished Patent Application Publication A9: Corrected Patent Application Publication B1: Utility Patent B2: Utility Patent (issued after reexamination) C1, C2, C3, etc.: Reexamination Certificate E1: Reissue Patent H1: Statutory Invention…
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