This subject guide provides a starting point for research in patents and trademarks.
Last Updated: Apr 22, 2015
If you intend to make, use, or sell an invention of yours, you should find out whether someone else has created something like it already. You have a number of options when it comes to searching for patents. Below are some patent searching sites.
- US Patent & Trademark Office - Patent Searching
Covers US patents issued from 1790 to the most recent weekly issue date. See the USPTO website for important notices concerning the database.
- European Patent Office (Espacenet database)
Search for European, US, PCT, Japanese and other worldwide patents.
- Derwent Innovations Index
Derwent Innovations Index facilitates rapid, precise patent searching and merges the value-added patent information from Derwent World Patents Index with the patent citation information from Derwent Patent Citation Index.
- Google Patents
Covers patents and applications from USPTO and EPO.
- CIPO - Canadian Patents Database
A Canadian Patent database with data from 1989 to the present, and includes the patent number, classification, and title of patents.
- Japan Patent Office
A searchable database of Japanese patent abstracts, which includes the patent number, title, inventor, company, and abstract of the patent.
- PubEAST and PubWEST Searching
Covers 1920-most recent weekly issue. Onsite use at the Art, Architecture & Engineering Library.
- Free Patents Online
Covers patents and applications from USPTO, EPO, WIPO and JPL abstracts