903.02 Basis and Principles of Classification in USPC [R-07.2022]

Many of the principles that form the basis of classification within USPC 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 (http://ptoweb.uspto.gov/patents/classification- resources/) or the internet on the Office of Patent Classification home page (www.uspto.gov/Classification). Any questions not covered in this handbook can be directed to the Office of Patent Classification.