Sören Dahm was admitted to the German bar in 2012. Prior to his admission as a lawyer, he had worked in a patent attorney firm in Düsseldorf for several years. In July 2018 he was named partner at Kather Augenstein.

Sören Dahm specialises in patent infringement disputes. He advises and represents local and international clients in the national courts of all instances. He has also participated in, and coordinated cross-border litigations as part of various national teams.

Sören Dahm holds practical experience in numerous technical fields, especially in telecommunications, mechanical engineering, and the automotive, chemical and medical industries.

In addition to patent law, Sören Dahm also represents clients in trademark and unfair competition law, especially in infringement proceedings.

Sören Dahm is a member of GRUR, VPP and Young EPLAW.


Representative cases

  • Participation in a competitive process regarding competitive originality and imitation of natural-stone cobblestones (Higher Regional Court Cologne GRUR 2017, 1159 – natural-stone cobblestones)
  • Preliminary injunction proceedings for a major German automotive supplier, obtaining ex-parte injunctive relief for patent infringement by resolution
  • Infringement proceedings for breach of 5 different intellectual property rights at two court venues – dental engineering / chemical
  • Preliminary injunction proceedings for a luxury sports car manufacturer, obtaining injunctive relief for trademark infringement by resolution
  • Series of patent infringement lawsuits for infringement of 12 different standard essential patents at two court locations – mobile phones / LTE


  • Federal Court of Justice clarifies criteria in determining the protected subject matter of a registered design, Federal Court of Justice, decisions dated 20 December 2018 (I ZB 25/18 and I ZB 26/18), IPSANZ, issue 117, September 2019
  • The territorial scope of the risk of confusion of a multi-syllable union sound mark, Federal Supreme Court Judgment of 12.07.2018 – I ZR 74/17, IPRB 2019, 29
  • HRC Dusseldorf refuses to follow FCJ regarding cease and desist obligations in German patent cases, Higher Regional Court Düsseldorf, Decision of 30.04.2018, I-15 W 9/18 – Rasierklingeneinheiten, Intellectual Property Forum – IPSANZ, Issue 114, December 2018
  • Legal consequences of successful FRAND-objection, GRUR-Prax, 03/2017, 67-69