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There are a number of ways to find the patent number of an issued US patent or patent application. If the patent is for a product being manufactured, the patent number is often stamped on the product. Patent numbers are frequently listed on the website of the company issued the patent, or may be found by contacting the company for a list of patents.

If you already know the number of a US patent, and want to look up the patent, you can use the USPTO patent number search.

Searching The US Patent Office Site

Patents issued in the United States can be searched on the USPTO (United States Patent and Trademark Office) website. European patents, patents of WIPO (World Intellectual Property Organization) countries and other patents can also be searched on-line.

The US patent office allows for full electronic search of patents issued from 1976 onward. Patents issued from 1790 through 1975 are searchable only by issue date, patent number, and current US classification.

US patents can be searched by company, inventor, publication date, keywords or a combination of any of these search parameters. Keywords can be searched for in the patent title, abstract, text, or claims. The USPTO patent quick search allows searching up to two categories. More search categories can be specified using the USPTO advanced patent search web site.


DISCLAIMER: Please consult a patent attorney for advice on specific patent strategy

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