What is the Index to the U.S. Patent Classification System?
The Index to the U.S. Patent Classification System (USPC) is an alphabetic listing of technical and common terms that refer to specific classes and subclasses within the USPC. As stated in MPEP 902.01(a):
“The Index to the U.S. Patent Classification System (USPC) is an alphabetic listing of technical and common terms referring to specific classes and subclasses of the USPC.”
This index serves as an initial entry point into the classification system, helping users locate relevant classes and subclasses for their patent searches or applications.
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