PatentRef
US patent claims as a tree, through a free API
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Launched November 10, 2026
About PatentRef
A free US patent API in the PatentsView format for grants since 1976, plus a claim tree for every patent: claims split into their parts, each reference linked to its earlier mention, every part with offsets into the text. Deterministic code, no model.
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APIDeveloper ToolsData
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Aaron Baker
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