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Patent search engines and directories

FreePatentsOnline - The FreePatentsOnline search engine is one of the most powerful, fastest and easiest patent search engines on the web. Our search allows advanced search techniques such as word stemming, proximity searching, relevancy ranking and search term weighting to help you find exactly what you are looking for. And, our account features let you organize, annotate and share documents, and Alerts let you instantly be notified when new documents of interest are published.

Google Patent Search - With Google Patent Search, you can now search the full text of the U.S. patent corpus and find patents that interest you.

Intellectual Property Office - Intellectual Property Office is an operating name of the UK Patent Office

PatentStorm - PatentStorm offers full-text U.S. patents and patent applications from the U.S. Patent Office, providing advanced search capabilities and full image retrieval in handy PDF format. Everything we offer is free.

Whether you are an inventor, a patent attorney, a patent agent or just curious about how things work, this site is for you. Our database contains issued patents (including utility, design and plant patents) back to 1976, and yet-to-be approved patent applications back to 2005. Our content is updated weekly - at the same time the U.S. Patent Office updates theirs.

United States Patent and Trademark Office - Official web site.