WIPO
The "World Intellectual Property Organization" administers 23 international treaties, including the Madrid Protocol concerning the international registration of marks and the Patent Cooperation Treaty (PCT), for the filing of international patent applications.
http://www.wipo.int/export/portal/index.html.en

OPRI
On its "Intellectual Property" page, the Belgian "Federal Public Service for Economy, SMEs, Self-employed and Energy" gives practical information about the various aspects of intellectual property, (patents, marks, drawings and models, plant variety protection, copyrights, etc.), Belgian Acts applicable to intellectual property, the list of agents approved by the "Intellectual Property Office".
http://mineco.fgov.be/homepull_en.htm

DISTINCTIVE
Our privileged partner regarding trademarks, trade names, domain names, industrial designs and copyrights.
www.distinctive.be

ESPACENET
The database of the European Patent Office makes it possible to find and download European and other patents and patent applications.
Use the option "Advanced search", and a combination of the applicant's name, inventor's name, European or international classification.
ep.espacenet.com/advancedSearch?locale=fr_EP

IPC
International classification:
The identification of the international class relating to your technical area makes it possible for you to find the patents in that area.
http://www.wipo.int/classifications/ipc/ipc8/?lang=en

EPO
European Patent Office:
All legal and practical information about procedures before the European Patent Office. See in particular the pages "Tool box for applicants" and "The guide for applicants".
http://www.european-patent-office.org/index.en.php