Use as an initial starting point for investigating patents up to those published in the last few months. Google Patents also provides patents in PDF format. For a more comprehensive search, go to the USPTO or other patent offices, such as European Patents.
Complete listing of U.S. patents from 1790 to the present. The results include the fulltext of patents, as well as TIFF images.
You can also search for patent applications since March 2001.
This is another option for patent searching that allows you to save patents to your account. Fulltext searching of U.S. patents and applications. Set-up a free account to download patents in PDF format and to search chemical patents by structure, substructure and chemical name.
Free conversion of U.S. patents to PDF format. Enter patent number and it will be converted on the fly to a downloadable PDF file.
Is one of over 80 U.S. Patent and Trademark Depository Libraries. The Reference Services Department holds a microfilm collection of the fulltext of all U.S. Patents. The Library also maintains current files of registered and pending trademarks.
Describes themselves as providing access to more then 1 million international Patent Cooperation Treaty (PCT) applications in full text format on the day of publication. Abstracts in English, with full patent image in the language of the inventor's country.
1920-present. Searchable worldwide patents database from the European Patents Office (EPO). Free patent information with fulltext patents. Search recent patent applications from EP member states; search patents/view images from EPO, France, Germany, Switzerland, U.K., U.S., WIPO; search abstracts, bibliographic data from China, Japan, etc.
1976- present. Search the Patents Abstracts of Japan by keyword, publication number, inventor. Includes legal status information from 1990 forward. Database search page is in English but you must use Emperor's year for years prior to 1999.