What do the kind codes ‘C1’, ‘C2’, and ‘C3’ represent in U.S. patent documents?
The kind codes ‘C1’, ‘C2’, and ‘C3’ are used for specific types of U.S. patent documents. According to MPEP 901.04(a): “C1” – Reexamination certificate issued after the first reexamination proceeding “C2” – Reexamination certificate issued after the second reexamination proceeding “C3” – Reexamination certificate issued after the third reexamination proceeding These kind codes are important…
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