Free Patent Search
US Free Patent Search USPTO Depository Library Program
List of locations national. Also patent databases available on cd-rom or electronic databases - search online here. The Full-Text Database now offers all US patents issued since 1790, in the form of searchable numbers and current US classifications hyperlinked to full-page images of each page of each patent.
Free Patent Search sponsored by Delphion
Get free results according to keywords, other criteria requires a paid subscription.
Patents dot com
Patents dot com have launched their global patent search site as part of a platform comprised of over 12 million searchable patent documents in 3 languages. In the coming months, the company will add 12 more languages and continue growing the number of patent and translated patent documents to over 450 million.
Canada Patent Search Database
Full text images since 1920 of all patents filed in Canada - free patent search.
Europe - European Patent Register
Do a patent search with the EPR.
British Gateway - Europe's Network of Patent Databases
Free patent search of over 30 million documents from EPO member states,
British Patent Status Enquiry
The British Patent Office's patent register.
Japan - Industrial Property Digital Library
Search for patents and trademarks - Japanese gazettes and databases with some English translation.
Germany - DEPATISnet
Database hosted by German Patent Office.
AusPat, the new search system for Australian patents.