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U.S. Patents: Step 2

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

Use keywords to find initial class and subclass sections

From your list of keywords and synonyms, type this into the search text bar: CPC scheme [your search term here]

Searching the CPC scheme reults

From the results, click on a link that is relevant to what you're searching for.
TIP: If you are having trouble with finding relevant results, use the IPC for help by using common language phrases.