Felix-Reinhard Einsel


Felix-Reinhard Einsel

Managing Partner

Mr. Einsel possesses a diverse undergraduate and postgraduate educational background with degrees in Comparative Law and Electrical Engineering from both Japanese and American universities. He also has the distinction of being the only European national to be registered as a Patent Attorney in Japan at the present time and is also qualified in Japan as an IP Litigator. Mr. Einsel’s practice focuses on patent application and litigation matters in the areas of electrical engineering. Mr. Einsel is a noted expert on IP law in Japan and has given numerous seminars and published multiple articles on IP law and enforcement in Japanese, German, and English. He has also recently testified as an expert before the National Diet with regard to the upcoming reform of the employee’s invention law and unfair competition law.


Patent Attorney


Qualified IP Litigator in Japan (2003)
Japanese Patent Attorneys Association (1999)
Attorney at Law, State of New York, U.S.A. (1994)

Professional Experience

2009 – present

Managing Partner, Sonderhoff & Einsel Law and Patent Office

2005 – 2009

Vice Representative, Sonderhoff & Einsel Law and Patent Office
(formerly Dr. Sonderhoff Law Office)


Partner, Dr. Sonderhoff Law Office


Associate, Dr. Sonderhoff Law Office in Japan



Tokyo University of Science, B. Eng.,
Faculty of Technology-Electrical Engineering (Night School)


University of Washington, LL.M
School of Law – Asian Law Program

1988 – 1992

Rikkyo University, LL.B., Faculty of Law-Comparative Law


German, Japanese, English