Patent Extras - Tools & Other Resources - Patents - Research Guides at Case Western Reserve University

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Patents - Queen's University Library
Detailed source of tutorials, guides, handouts, etc.

Espacenet (EPO Patent Search Engine)
Includes all major countries.
Patent Public Search (USPTO)
Search U.S. patents & applications only
Japan Patent Office (JPO)
Canadian Intellectual Property Office
International Patent Applications
Google Patents Search
Search U.S. patents. Back to the very first has been scanned for keyword searching. The currency of uploads is unknown, so search elsewhere if looking for the most current. Also includes the European Patent Office (EPO), China, Germany, Canada, and the World Intellectual Property Organization (WIPO).