How to find patents
Last Updated: Sep 11, 2012
- European Patent Office
A collection open to the world. Pre-1976 US Patents do not require a TIFF image viewer plug-in.
- US Patent Office
US Patent & Trademark Office (USPTO). Patents prior to 1976 require a TIFF image viewer plug-in.
- 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.