European patent office (EPO)
http://www.epo.org

United States patent office
http://www.uspto.gov

Belgian patent office
http://economie.fgov.be/ nl/ondernemingen/ Intellectuele_Eigendom/ index.jsp

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

Benelux Office for Intellectual Property (BOIP)
http://www.boip.int

Office of Harmonization for the Internal Market (OHIM)
http://oami.europa.eu

Benelux Office for Intellectual Property (BBMI)
http://www.boip.int

Office of Harmonization for the Internal Market (OHIM)
http://oami.europa.eu

World Trade Organisation (WTO)
http://www.wto.org