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Intellectual Property Portal: Patents & Trademark

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Canadian Intellectual Property Office
Canadian Patents Database
Espacenet
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European Patent Office - Searching for Patents
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Free Patents Online (FPO)
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IP Australia: Searching for a Patent
Patexia. Research - Patent Search
USPTO - Search for Patents
Find full-text patents from 1976 to the Present, and image patents from 1790.
WIPO
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