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2. Patent Application Information Retrieval - Wikipedia

   en.wikipedia.org/wiki/Patent_Application...

   Patent Application Information Retrieval (PAIR) is an online service provided by the United States Patent and Trademark Office to allow users to see the prosecution histories of United States patents and patent applications and obtain copies of documents filed therein. There are two services: Public PAIR, which allows the general public to ...

3. 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.

4. 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."

5. 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 is an agglomeration database, that takes bibliometric data from other databases (such as Crossref , PubMed , Microsoft Academic and Open Alex ) and combines them ...

6. Prior art - Wikipedia

   en.wikipedia.org/wiki/Prior_art

   Patent Application Information Retrieval (PAIR), the USPTO search engine for patent and patent application file histories displays reasons why patents are issued; search by application number or customer number. Seven Step Strategy, USPTO patent search strategy. European Patent Office

7. 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.