Patent ClassificationUSPTO adopts Cooperative Patent Classification. Check the mapping USPC to CPC to see where your patent area falls in the new classification scheme.
CAS Coverage of PatentsCAS covers patents from around the world. Patent records from nine major patent offices worldwide that meet CAS selection criteria are available online in CAplusSM within two days of the patent's publication, and fully indexed by CAS scientists within 27 days from the date of issue.
Canadian Patents DatabaseThis database lets you access 93 years of patent descriptions and images. You can search, retrieve and study more than 2,140,000 patent documents.
Espacenet Patent SearchEspacenet offers free access to more than 80 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today.
Free Patents OnlineBasically free full-text and/or images of patents from a variety of sources worldwide. Includes combined search option so you can search U.S., U.S. patent applications, European Patents, Japanese Patents (abstracts only), and WIPO. Also has a new chemical patent search feature. Be sure to check coverage for each database prior to searching.
Japan Patent OfficeJapan patents, trademarks, design patents, utility models, and international applications.
United Kingdom Intellectual Property OfficeThe Intellectual Property Office (IPO) is the official UK government body responsible for intellectual property (IP) rights including patents, designs, trade marks and copyright.
U.S. Patent and Trademark OfficeThis link opens in a new windowIncludes full-text of issued patents since 1976, full-page images since 1790, and published applications since March 15, 2001.