Links

Austria Patent Office:

http://www.patentamt.at/Home/index.html 

German Patent Office:

http://www.dpma.de/english/index.html 

European Patent Office:

http://www.epo.org/index.html

International Office:

http://www.wipo.int/portal/index.html.en

Office for Harmonisation in the Internal Market:

http://www.wipo.int/portal/index.html.en

US-Patent Office

http://www.uspto.gov/

Search possibilities in international patent database

http://depatisnet.dpma.de
http://worldwide.espacenet.com/

A patent search using only keywords frequently gives an incomplete picture. All patent publications are divided into classes. As a result a more comprehensive class search is possible. Information on the class classification can be found for example at:

Informations on the class classification

http://depatisnet.dpma.de/ipc/