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2. Patentscope - Wikipedia

   en.wikipedia.org/wiki/Patentscope

   PATENTSCOPE offers advanced search options to help users refine their queries and retrieve precise results. Users can apply various search filters, such as publication date, patent classification, applicant's name, and legal status, to narrow down their searches.

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. 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 ...

5. 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."

6. Justia - Wikipedia

   en.wikipedia.org/wiki/Justia

   The website offers free case law, codes, opinion summaries, and other basic legal texts, with paid services for its attorney directory and webhosting. [ 2 ] [ 3 ] In 2007, The New York Times reported that Justia was spending around "$10,000 a month" in order "to copy documents" from the United States Supreme Court and publish them online, to be ...

7. Derwent World Patents Index - Wikipedia

   en.wikipedia.org/wiki/Derwent_World_Patents_Index

   The Derwent World Patents Index (DWPI) is a database containing patent applications and grants from 44 of the world's patent issuing authorities. [1] [2]Compiled in English by editorial staff, the database provides a short abstract detailing the nature and use of the invention described in a patent and is indexed into alphanumeric technology categories to allow retrieval of relevant patent ...