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Espacenet
Espacenet (European Patents Office)
Espacenet provides access to patents produced by national patent offices in Europe as well as the European Patent Office (EPO), the World Intellectual Property Organization (WIPO), and Japan.
ISO: International Standards
United States Patent & Trademark Office
USPTO (United States Patent & Trademark Office)
US Patents provides access to a full-text patent database, which currently contains over six million patents recorded at the U.S. Patent and Trademark Office (USPTO). Records cover the period from 1790 to the most recent weekly issue date.