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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.
INPADOC, which stands for International Patent Documentation, [1] [notes 1] is a freely available international patent database. It is produced and maintained by the European Patent Office (EPO). INPADOC developed a patent families classification, which groups together patent applications (and issued patents) originating from the same priority ...
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."
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.
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 into ...
A search or "international search" is then made by an authorized international searching authority (ISA) to find the most relevant prior art documents regarding the claimed subject matter. The search results in an international search report (ISR), together with a written opinion regarding patentability .