Patent column belongs to Work Category of 18DAO online reference service. It's edicated to patents, and patent law. You can search more than seven million US patents.
United States Patent and Trademark Office
The US Patent and Trademark Office (PTO) now offers World-Wide Web (Web) access to bibliographic and full-text patent databases.
Patent - Wikipedia, the free encyclopedia
A patent is a set of exclusive rights granted by a state to a patentee (the inventor or assignee) for a fixed period of time in exchange for the regulated, ...
Search more than seven million US patents.
Patent Analytics and Patent Searching
Complete Patent Searching Database and Patent Data Analytics Services.
The European Patent Office
The executive body of the European Patent Organisation.