How can I access and search the CPC database?

This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice.

The CPC database can be accessed and searched through various tools provided by the USPTO and EPO. According to MPEP 905.03(a), “The CPC schemes and definitions are available online from the USPTO’s website at https://www.uspto.gov/web/patents/classification/cpc/html/cpc.html.” To search the CPC database effectively:

• Use the USPTO’s CPC search tool or the EPO’s Espacenet database
• Familiarize yourself with the CPC structure and symbols
• Utilize keyword searches in combination with CPC symbols for more targeted results
• Consider using the CPC definitions to understand the scope of each classification

Remember that the CPC database is regularly updated, so it’s important to check for the most recent classifications when conducting your search.