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Google has launched its own search engine for patents (beta version) in December 2006 :
http://www.google.com/patents
It is designed to sift through about 7 millions U.S. patents by a variety of parameters including filing date, issue date, patent number and inventor.
Google claims to offer a more searchable format than the one provided by the US Patent Office .
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Google's engine includes pre-1976 patents, but does not currently include patent applications, international patents, or U.S. patents issued since mid-2006, but Google said that these enhancements are in the works.
According to Marcel D. Mongeon ( Intellectual Property Coach in Canada), a nice feature of Google Patent is to allow searching full text such as “T.A. Edison” (or other permutations), which is more difficult with other tools.
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Other free patent search engines are :
1) European Patent Office: http://ep.espacenet.com
2) US Patent Office: http://patft.uspto.gov/netahtml/PTO/search-adv.htm (you have to use the USPTO command line search syntax)
Patent search engines are really useful to know the state-of-the art about a new technology or invention. Technology Transfer Offices use them all the time - and so do I when receiving invention disclosures from MaNEP members (5 received in 2006).
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