The United States Patent and Trademark Office (USPTO) Public Search Facility located in Alexandria, VA provides the public access to patent and trademark information in a variety of formats including on-line, microfilm, and print.

Home page of the United States Patent and Trademark Office's main web site.

Find out how to apply for and maintain a patent in the U.S., and learn about helpful resources.

Search and read the full text of patents from around the world with Google Patents, and find prior art in our index of non-patent literature.

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Patent Center allows users to search and view patent applications and filings.

It provides information on patent search, patent analytics, technology transfer, and institutional IP policies, combining reference data with expert insights into resources, tools, and good practice recommendations.

This patent search tool allows you not only to search the PCT database of about 2 million International Applications but also the worldwide patent collections. This search facility features: flexible search syntax; automatic word stemming and relevance ranking; as …

Search and read the full text of patents from around the world with Google Patents, and find prior art in our index of non-patent literature.

Free search of international patent applications filed under the PCT System and in many national collections.