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U.S. Patents: Step 4

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

Accessing complete patent documents

Use this link to find patents already issued by the USPTO.

Use this link to find patent applications sent to the USPTO.

Searching for Patents using either PatFT or AppFT

Whether you use the PatFT or the AppFT database, the search will be the same.

In the Field column, click to expand the menu options and select Current CPC Classification.

Enter the classification code into the search box. Make sure you remove any spaces in your code.