MPEP 903.02
Basis and Principles of Classification

Ninth Edition of the MPEP, Revision 10.2019, Last Revised in June 2020

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903.02    Basis and Principles of Classification [R-10.2019]

Many of the principles that form the basis of classification used in the U.S. Patent and Trademark Office are set forth in the "Examiner Handbook to the U.S. Patent Classification System" which can be accessed from either the intranet on the Classification Home Page ( classification-resources/ ) or the internet on the Office of Patent Classification home page ( classification-standards-and-development ). Any questions not covered in this handbook can be directed to the Office of Patent Classification.