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Patents: A How-To-Find Guide

Information on locating full-text of patents granted worldwide.

Patent Search Engines

Please note: many other patent websites will provide some free information and will provide additional search types or features for a fee. If a free search does not produce results, do not assume a patent does not exist. Free-access databases have use search engines of varying quality, and patent search terms can vary tremendously from country to country. If you are seriously considering applying for a patent, a free search can help you find out whether or not a similar patent already exists; however, first time patent applicants are strongly encouraged to consult some of the books for beginners listed on the Books tab of this guide.

Erin Thomas's picture
Erin Thomas
150 Parks Library
Iowa State University
515 294-9886