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U.S. Patents: Step 3

A step-by-step guide to searching for patents on the U.S. Patent and Trademark Office site using the patent classification system.

Determining Relevancy

Scroll down the list and carefully view the options available not only to the left of the description but sometimes also to the right in parentheses.

You can record the classification numbers, or click on it to open that page and view sub-categories as shown below. Keep track of the classification codes on the right hand side of your handout.