What classification systems are used in patent searches?
Patent searches utilize multiple classification systems to organize and search for prior art. According to MPEP 904.02(a), the main classification systems used are:
- Cooperative Patent Classification (CPC)
- U.S. Patent Classification (USPC)
- Other organized systems of literature
The MPEP states:
“Every group/subgroup and secondary classification area of the Cooperative Patent Classification, class/subclass of the U.S. Patent Classification, digest, and cross-reference art collection pertinent to each type of invention claimed should be included, from the largest combination through the various subcombinations to the most elementary part.”
Examiners should consider all relevant classification areas across these systems to ensure a comprehensive search.
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