Where can I find more information about the Cooperative Patent Classification (CPC) system?

For those seeking more detailed information about the Cooperative Patent Classification (CPC) system, MPEP 903 provides a helpful reference: “See MPEP § 905 for information on CPC.” MPEP 905 offers comprehensive guidance on the CPC system, including its structure, how to use it for patent searching, and its implementation in the patent examination process. This…

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