Manual of Patent Examining Procedure - MPEP

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900 Prior Art, Classification, and Search

903.02 Basis and Principles of Classification

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 (http://ptoweb:8081/) or the Internet on the Office of Patent Classification home page (http://www.uspto.gov/web/offices/opc/). Any questions not covered in this handbook can be directed to the Office of Patent Classification.

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