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  2. Patentscope - Wikipedia

    en.wikipedia.org/wiki/Patentscope

    PATENTSCOPE is a global patent database and search system developed and maintained by the World Intellectual Property Organization. It provides free and open access to a vast collection of international patent documents, including patent applications, granted patents, and related technical information.

  3. Espacenet - Wikipedia

    en.wikipedia.org/wiki/Espacenet

    In 2004, i.e. in the early years of Espacenet, Nancy Lambert considered that, although free, Espacenet, like the United States Patent and Trademark Office (USPTO) database of US patents, "still tend[ed] to have primitive search engines and in some cases rather cumbersome mechanisms to download patents."

  4. Google Patents - Wikipedia, the free encyclopedia

    en.wikipedia.org/wiki/Google_Patents

    Wikipedia entry for Google Patents.Google Patents is a search engine from Google that indexes patents and patent applications from the United States Patent and Trademark Office.

  5. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    In April 2023 the PDF Association made ISO 32000-2 available for download free of charge. ... Adobe holds patents to PDF, but licenses them for royalty-free use in ...

  6. The Lens - Wikipedia

    en.wikipedia.org/wiki/The_Lens

    The Lens, formerly called Patent Lens, is a free searcheable online patent and scholarly literature database, provided by Cambia, an Australia-based non-profit organization. The Lens has been hailed as the “most comprehensive scholarly literature database, that exceeds in its width and depth two leading commercial databases ( Web of Science ...

  7. United States Patent and Trademark Office - Wikipedia

    en.wikipedia.org/wiki/United_States_Patent_and...

    The USPTO's free distribution service only distributes the patent documents as a set of TIFF files. [100] Numerous free and commercial services provide patent documents in other formats, such as Adobe PDF and CPC.

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