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European patent office: http://www.epo.org/
Espacenet Patent search: http://worldwide.espacenet.com
: http://economie.fgov.be/fr/entreprises/propriete_intellectuelle/
Benelux IP office: http://www.boip.int
World Intellectual Property Organization: http://www.wipo.int
Office for Harmonization in the Internal Market: http://oami.europa.eu
Unites State Patent & Trademark Office: http://portal.uspto.gov