Within the research process patent applications are often the first published account of the invention and it may also be the only published account. About 60 % of the information described in patents are not published elsewhere.
When searching in patent databases using notations of the International Patent Classification is a good tool to find subject specific patents which are often described in the title or the patent itself very global.
- Free of charge, full texts in PDF
- German patents from 1877
- US patents from 1790
- Enhanced version of the IPC
- Searching for the naming of classes and notations possible
- Free of Charge, US patents
- Full texts in tiff format, special viewer necessary!
- displayed with all capillary ramifications
- searching with English keywords for the naming of notations possible
- Free of charge, full texts
- German, European and world patents
- displaying tables of partial notations in pdf possible
- Service of the World Intellectual Property Organization (WIPO)
- Important commercial patent database, not availbale within TUHH intranet
- Patents world-wide
Older patents are often found only when searching for the exact patent number. Search in database fields like title, inventor, abstract, notation of IPC or even full text is often only possible starting from a distinct year which depends of database and country of origin of the patent.
More about patents
- … and how to search for them can be found at the websites of the patent offices mentioned above.
- A good summary from an international view: End-User Patent Searching Using Open Access Sources von Pat LaCourse