BDPE Patent Attorneys and Attorneys at Law

Ottostraße 4
D-80333 München

Fon +49 (0)89 – 21 53 819-0
Fax +49 (0)89 – 21 53 819-19


BDPE Patent Attorneys and Attorneys at Law

Platz der Ideen 2
D-40476 Düsseldorf

Fon +49 (0)211 – 30 27 66-0
Fax +49 (0)211 – 30 27 66-10

Stefan Demmel

Patent attorney | Munich

Patent Litigation

„Franck Klein also offers up his expertise on this mandate and earns praise from another satisfied patron for being “extremely skilled, open minded and collaborative. He takes the time to discuss matters in person, which speeds up the process and brings in better results thanks to the exchange of information and brainstorming that happens during such conversations. Franck is also proficient in all three official languages of the EPO, so he grasps the nuances of language used in patent applications and can propose new arguments in opposition proceedings on this basis.“

– IAM Patent 1000 Guide 2024

„Further strengthening the set, Markus Kreuzberg thrives when working with domestic companies seeking protection across the globe. He adroitly oversees the drafting and filing of international patent applications for companies including Conradi+Kaiser, a family-owned business that has established itself as a leader in rubber moulded parts.“

IAM Patent 1000 Guide 2024

„We selected them because of their outstanding performance in nullity actions and defence work in infringement actions.“

- IP STARS 2023

„The firm understands the business of the client and is clear and transparent in its communication. Excellent forensic work.“

- IP STARS 2023

„In the fields of physics, electrical engineering and electronics, and mechanical patent litigation, the firm sets new standards for Germany.“

- The Legal 500 – Germany

„For contentious proceedings, in particular for nullity proceedings or infringement proceedings accompanied by patent attorneys, Maikowski & Ninnemann, BRAUN-DULLAEUS PANNEN EMMERLING, df-mp as well as the already mentioned Bardehle Pagenberg and Cohausz & Florack are among the top addresses; Zimmermann & Partner Patentanwälte mbB and Maiwald Intellectual Property also enjoy an excellent reputation in the market.“

- The Legal 500 – Germany

„Four partners and several staff work proactively to provide a complete service ranging from providing non-infringement or infringement arguments, successfully fighting for or against the validity of patents, knowing about and finding necessary evidence, suggesting workarounds to problems, and usually winning cases or suggesting useful solutions.“

- The Legal 500 – Germany

„Service-oriented patent attorneys who go above and beyond for their clients. The attorneys exhibit the knowledge level of top technical specialists and, through this, light can be shed on weak arguments of the opposite party.“

- IAM Patent 1000 Guide 2022

„The patent attorneys are all highly experienced and drive their work while being practical and efficient.“

- Chambers 2021

„The team is detail oriented, sensible and shows great judgement.“

- IAM Patent 1000 Guide 2021

Dr. Dirk Müssig | Patentanwalt | BDPE Düsseldorf

Stefan Demmel is a patent attorney and has been practicing intellectual property since more than 5 years. Until he joined BDPE in 2023, his main focus was on drafting patent applications as well as on patent prosecution. Beyond his comprehensive knowledge in claim drafting, he contributes an extensive technical knowledge. At BDPE, he is actively involved in patent litigation proceedings.

read more

Stefan is admitted to practice as a patent attorney since October 2022. His technical expertise extends in particular to the fields of communications engineering, electrical engineering, semiconductor technology, heating engineering, mechanical engineering, data processing and software.

During his studies in electrical engineering and information technology at the Technical University of Munich, he was able to acquire both broad and in-depth technical knowledge, especially in the field of communications and high-frequency engineering.

Fon +49 (0)89 – 21 53 819-27


  • German Patent Attorney
  • European Trademark and Design Attorney
  • Study of Electrical Engineering and Information Technology (M.Sc., TU München)

Authorized to represent

  • Germany:
    • Federal Court of Justice (only patent nullity proceedings)
    • Federal Patent Cout (BPATG)
    • German Patent and Trade Mark Office (DPMA)
  • Europe:
    • European Union Intellectual Property Office (EUIPO)
  • International:
    • World Intellectual Property Organization (WIPO)

Technical fields

Telecommunications/ Mobile Communications

Electrical and information technology


Audio-video encoding