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Open Google Patents →Over 150 million historical and modern patent documents from the European Patent Office.
Open Espacenet →Comprehensive global overview explicitly designed for international PCT applications.
Open Patentscope →Official, detailed search portal for United States patents and published applications.
Open USPTO Search →Free, open global portal mapping patent data alongside related academic literature.
Open Lens.org →Official English-interface tool to look up Japanese patent documents and utility models.
Open J-PlatPat →