Patent and Trademark Offices
United States Patent and Trademark Office (USPTO)
World Intellectual Property Organization
Patent Searching
USPTO Search Engine for Issued U.S. patents
USPTO Search Engine for Published U.S. Patent Applications
Patent Scope for International Patent Applications
PDFs for Patents and Published Patent Applications
Trademark Searching
USPTO Search Engine for Trademarks
World Intellectual Property Organization Global Brand Database
General Information
USPTO basics for Patents
USPTO basics for Trademarks
World Intellectual Property Organization basics for Patents
World Intellectual Property Organization basics for Trademarks