Member countries of the Nordic Patent Institute

  Danish Patent and Trademark Office
  Norwegian Industrial Property Office
  Icelandic Patent Office
 

International Organisations

  World Intellectual Property Organisation (WIPO)
  WIPO website for Small and Medium-Sized Enterprises (SMEs)
  Patentscope - WIPO website on patents
  European Patent Office (EPO)
 

Classification Systems

  International Patent Classification (IPC)
 

Portals og databases

  espacenet.com - European network of patent databases