How to find patents
Last Updated: Aug 1, 2014
- European Patent Office
A collection freely open to the world.
- US Patent Office
US Patent & Trademark Office (USPTO). Patents from 1790 through 1975 are searchable only by Issue Date, Patent Number, and Current US Classification.
- LexisNexis Academic
Click on US Legal and drop down to Patents on the left for patent search options.
The FreePatentsOnline search engine is one of the most powerful, fastest and easiest patent search engines on the web.
- Japan Patent Office
Official site of the Japan Patent Office.
- Japanese, Chinese or Korean Patent Help
This virtual help desk provides answers to the most frequently asked questions on patents and patent information in China, India, Japan, and Korea. You can also find background information on filing trends and granting procedures and some guidance on common patent terminology of Asian patents.
- Indian Patent Information Retrieval System
Search for Indian patents
- Comparison of Free Patent Databases
A blog offering an interesting comparison of Google Patents, FreePatentsOnline, Patents.com, Patents Lens, and the USPTO patent databases. The European Patent office is not included in the comparison.