Our Roots and History

Starting in 1980 Hermann Kahlhöfer began his career as a patent attorney in a patent department at Siemens AG. 1985 he qualified himself and was admitted a European Patent Attorney and five years later a patent assessor in Germany. At Siemens AG he got to know the mindsets, working methods and specific needs of small and large scale industrial companies so that in 1992, when he moved to Bardehle Pagenberg, a patent attorney and lawyer firm, his knowledge and expertise where a great profit to the firm.

Ditmar Neumann was trained at a firm of patent attorneys with a long tradition, where, after being admitted as a patent attorney in 1991, he primarily advised and looked after SMEs in relation to the acquisition and enforcement of IP rights. Later, he qualified himself and was admitted as a European Patent Attorney. In 1994 he likewise moved to Bardehle Pagenberg, which profited greatly from his extensive knowledge and experience in both the technical and legal spheres.


The founding

After working together for a number of years, in 2000 Hermann Kahlhöfer and Ditmar Neumann grasped the initiative and founded KNH Patentanwälte in Duesseldorf. Since the beginning of 2001, they have deployed their combined experience, their extensive specialist knowledge and their commitment for the benefit of our national and international clients.

Hermann Kahlhöfer left the partnership in 2013 and has been working in a different office since 2018. Ditmar Neumann is still a partner in the firm today. He acts on behalf of our clients primarily in opposition and opposition appeal proceedings before the German Patent and Trademark Office and the European Patent Office. Additionally, his Master of Laws (LL.M.) degree also entitles him to represent our clients before the European patent infringement court (Unified Patent Court, UPC), which is due to come into being.

Success story

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The different property rights

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