A patent search feature has been integrated with Google's ever increasing range of services. The patent search at the time of writing seems to search US patents only as it pulls data from USPTO database. It covers all the 7 million (approx) patents issued by USPTO since 1790. The contribution of Google being conversion of all the image database of patents of USPTO into searchable format.
Search Queries--
» To search patents by patent number(lets patent no be 1247412) -- patent:1247412
» To search by inventor (ex. patents awarded to Edision) -- ininventor:edison
» To search by assignee ( ex. assigned by Fairchild) -- inassignee:fairchild
» By classification
US Classification -- uspclass:"99/385"
International Classification -- intlpclass:"A63B 6308"
You can use advanced search to search by filing date or issue date to narrow down your results.
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