Virtual collection

AusPat is the comprehensive search system for Australian patent data; providing a single point of enquiry for information on Australian patents. It allows you to search for applications via Quick, Structured or Advanced search options.

DOE patent is the U.S. Department of Energy's central collection of patent information, where research and development intersect with innovation and invention. This collection demonstrates the Department's considerable contribution to scientific progress from the 1940s to today.

Espacenet offers free access to more than 70 million patent documents worldwide, containing information about inventions and technical developments from 1836 to today.

FPO is home to the world's most popular patent search engine-a fast, easy-to-use, and reliable service used by 100's of millions world-wide since 2004. FPO is the crown jewel in the SumoBrain Solutions (SBS) ecosystem of web properties and professional services. SBS has pioneered the democratization of "big data" and has built a powerful portfolio of tools and expertise to help organizations navigate intellectual property information (and other data), as well as advanced analytics and solutions integration.

As part of Google's mission to organize the world's information and make it universally accessible and useful, we're constantly working to expand the diversity of content we make available to our users. With Google Patents, you can now search the full text of the U.S. patent corpus and find patents that interest you.

Here you can Search patents using Title, Inventor, Applicant/Assignee and I.P. Classification.

Search our on-line patents register by patent or publication number for the current status or complete status history of a patent application or a granted patent.

The ipInsiders's Toolbar (formerly known as the IPEstonia Toolbar) is a free patent, prior art and other intellectual property search tool and collection of free online patent and non-patent information databases, created by Mikk Putk.

Free patent and other prior art search tool and collection of free online patent databases. Includes more than 100 patent and non-patent information search fields; intellectual property link directory to patent search engines and databases, supporting tools for patent information searching and analyzing, IP information providers, IP forums, groups and communities, tools for trademark, brand and domain name searchers; national patent, trademark and design databases, patent classification finders. In addition RSS feeds of WIPO, EPO and other IP news, IP Tweets.

Patent Lens is a worldwide, open-access, free full-text patent informatics resource. It serves as the cyberinfrastructure platform for the Initiative for Open Innovation (IOI). Patent Lens provide acces to 11,871,472 patent documents.

The Patent Pal is a free resource for the patent community. It contains over 30 unique patent related searches. The patent search engines include Google Patents, FreePatentsOnline, Esp@cenet, WIPO, Pat2Pdf, the MPEP, and many more. You can see a list of available searches on the screenshots page. It also includes links to other useful resources for both US and foreign patent practice, such as links to foreign patent laws and virtually every major patent office in the world.

Using PATENTSCOPE you can search 10,805,564 patent documents including 2,078,150 published international patent applications (PCT).

Patents from 1790 through 1975 are searchable only by Issue Date, Patent Number, and Current US Classification.
When searching for specific numbers in the Patent Number field, patent numbers must be seven characters in length, excluding commas, which are optional.