The U.S. Patent and Trademark Office is a federal agency of the U. S. Department of Commerce and has a strong website featuring a search engine to help identify patents and trademarks. It also contains full text of all U.S. patents, including the art work. Issued patents are available full-text since 1976, full-page images since 1790. Patent applications are available since 15 March 2001. Also available here is access to the Trademark Electronic Search System, TESS, which contains more than 3 million pending, registered and dead federal trademarks.
useful for research on patents and trademarks. Some are available in print and others are available in an online version.
available in an online version at: http://www.uspto.gov/go/classification/uspcindex/indextouspc.htm
Alphabetical list of subject headings referring to specific classes and subclasses; this is the best place to start for those unfamiliar with patent classification.
Available in an online version at: http://www.uspto.gov/web/patents/classification/
Lists all classes and subclasses of inventions. Includes subject index.
available in an online verstion at: http://www.uspto.gov/web/offices/ac/ido/oeip/taf/def/index.htm
Describes new and revised classes and subclasses and changes in patent classification.
The current 52 weeks is available and maintained in an online version at: http://www.uspto.gov/web/patents/patog/
This library is a Congressionally designated depository for U.S Goverment documents. Public access to the Goverment documents is guaranteed by public law(Title 44 U.S.C).