• DPMA: German Patent and Trade Mark Office
• BPatG: Federal Patent Court
• EPA: European Patent Office
• HABM: Harmonization Office in the Internal Market of the EU
• EU Kommission: Intellectual Property
• WIPO: World Intellectual Property Organization
• US-PTO: United States Patent and Trademark Office

BGH Rulings:

• BGH Online Publications
  

Research databases (free of charge):

• DPMA Register
• esp@cenet (EPA’s patent investigation database)
  

Institutions:

• epi
• Patent Agents Society
• Patent Information Center of Stuttgart

Lectures:

• University of Stuttgart: "German and European Patent Law"