Dr. Gassner & Partner mbB

German Patent and Trademark Office (GPTO)
http://www.gpto.de/english/index.html

European Patent Office (EPO)
http://www.epo.org/

French Patent Office (INPI)
http://www.inpi.fr/

British Patent Office
http://www.patent.gov.uk/

Austrian Patent Office
http://www.patentamt.at/

Swiss Patent Office
https://www.ige.ch/en.html

World Intellectual Property Organization (WIPO)
http://www.wipo.int/

The Trade Marks and Designs Registration Office of the European Union (OHIM or OAMI)
http://oami.europa.eu/

Korean Intellectual Property Office (KIPO)
http://www.kipo.go.kr/en/

Chinese Patent Office (SIPO)
http://english.sipo.gov.cn/

Japanese Patent Office
http://www.jpo.go.jp/

United States Patent and Trademark Office (USPTO)
http://www.uspto.gov/

Canadian Intellectual Property Office (CIPO)
http://www.cipo.ic.gc.ca/

Further links to patent and trademarks offices around the world
http://www.gpto.de/english/service/links/patent_and_trademarkoffices/index.html