5 links
Canadian Patents Database
patents1.ic.gc.ca
Search, retrieve and study more than 1,400,000 patent documents. From the Canadian Intellectual Property Office.
European Patent Office
european-patent-office.org
The executive body of the European Patent Organisation.
U.S. Patent & Trademark Office
uspto.gov
Patent and trademark information in the United States, including free database searching of registered trademarks, registration information, pricing and contact phone numbers.
World Intellectual Property Organization
ipo.int
Responsible for the promotion of the protection of intellectual property throughout the world, and for administration of various multilateral treaties dealing with intellectual p…