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Freischem & Partner


Your Patent Attorney

We will support the successs of you and your business. We advise you on all aspects of industrial property rights - patents, trademarks and designs. We look forward to help you not only in protecting your intellectual property, but also in dealing with competitors.

Patent law

Patents can be used to protect technical inventions and secure the inventors' exclusive right of use for up to 20 years.

Trademark law

Trademarks protect the use of names, logos or other signs and indications (color combinations, positions, sounds, etc.) as an indication of origin for products or services in the trade.

Design law

Designs protect and monopolize the shape or ornament of a two- or three-dimensional object for up to 25 years.

Competition monitoring

(patent, trademark, design monitoring)
Durch die Überwachung von gewerblichen Schutzrechts­aktivitäten (Patente, Marken, Designs, Gebrauchsmuster) können Aktivitäten von Wettbewerbern kurzfristig erkannt und dadurch neue Trends erkannt werden.

Avoiding Collision

We are also happy to advise you on how to avoid infringing on your competitors' property rights. The best inventions frequently arise from such considerations. This aspect of patent-driven development is an essential aspect of promoting innovation through technical property rights.


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About the firm

Since 1966, we have been handling patents, trademarks and designs for predominantly German medium-sized and larger companies. Our firm was founded by Werner and Ilse Freischem. In the course of time, the team of patent attorneys was strengthened first by their son Stephan and later by other patent attorneys. While growing, we were able to preserve the family character of the firm. You can read more about this in the History section. Our office is centrally located at Barbarossaplatz in Cologne, Germany. It is easily accessible by public transport. Of course, an underground car park is also available for our clients.

Currently, there are four patent attorneys working in our office. Their work is supported by dedicated employees.



Stephan Freischem

European Patent, Trademark and Design Attorney

Dipl.-Phys. Dr. rer. nat.

Martin Tongbhoyai

European Patent, Trademark and Design Attorney

Dipl.-Ing. Dipl.-Kfm.

Thomas Buchenau

European Patent, Trademark and Design Attorney

Dipl.-Ing. Dr.-Ing.

Hans-Martin Helwig

European Patent, Trademark and Design Attorney


Every patent attorney in our firm has completed a degree in science or engineering. Subsequently, each patent attorney has undergone years of additional training to qualify as a national patent attorney and has passed the European Qualifying Examination of the European Patent Office.

All our patent attorneys are admitted to practice before the German Patent and Trademark Office (DPMA), the Federal Patent Court (BPatG), the European Patent Office (EPA) and the European Union Intellectual Property Office (EUIPO) as well as the World Intellectual Property Office (WIPO) and participate in disputes before ordinary courts. They are subject to the Law on Patent Attorneys and are members of the Chamber of Patent Attorneys.

How can we support you as a patent attorney?

Are you looking for support in the area of Patents, Trademarks and Designs? Do you want to make the future of your company more secure in the long term? We mainly advise German medium-sized and larger companies in the field of intellectual property. We focus on the areas of patent law, trademark law and design law. Mainly we assist in the preparation of patent applications, trademark applications and design applications. Furthermore, we carry out patent searches, trademark searches, design searches, observations of competition, consultations on employee inventions, on avoiding patent conflicts and on license agreements. In addition, we also advise on attacking or defending infringement suits. You can find out more about our services in the sections Fields of Activity and Client Care. 

Practice Areas

You are looking for support for the protection of your inventions, trademarks and designs? Do you want to sustainably secure the future of your company? The FREISCHEM team represents you in all matters relating to Designs, patents, trademarks, employee invention law and ArbeitnehmererfinderrechtFrom the initial consultation to the registration and maintenance of intellectual property rights as well as their defense, you get everything from us from a single source. We are pleased that you have become aware of us! Do you have further questions? Write to us! You are welcome to contact our law firm directly.

Client Counseling

For more than 50 years, we have been advising clients in Germany and abroad in the entire field of industrial property. Our clients include international corporations as well as medium-sized companies and start-ups. Together with them, we develop strategies to protect their inventions, trademarks and designs nationally and internationally in an optimal and cost-conscious manner. Close personal contact with our international associates ensures fast and uncomplicated protection of our clients' interests worldwide.



Intellectual property law is increasingly gaining relevance for the information technology (IT) sector. In addition to patent protection for hardware components, the protection of inventions implemented by computer software is a focus of patenting activities. Since software is fundamentally abstract, it is subject to special patenting requirements. A computer implemented invention may be patented in Europe if the novel features of the proposal make a technical contribution.

IP for sustainability

A particular focus of economic activities is emerging in the area of sustainable technologies. With the aim of protecting and preserving the environment for society and future generations, entire branches of industry are growing around different sustainable technologies. Be it in the field of hydrogen technology or the optimization of climate forecasts through artificial intelligence - there is much to do and much to protect.


We are pleased that the quality of our work is being recognized:

Named as one of „Europe’s Leading Patent Law Firms“
Financial Times, Special Report // 24. Juni 2021
Named as one of „Europe’s Leading Patent Law Firms“
Financial Times and Statista 2019
WiWo Top patent law firms
Wirtschaftswoche // 21. September 2017
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The best patent attorneys
Wirtschaftswoche // 17. August 2017
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The best patent attorneys
Wirtschaftswoche // 09. November 2015
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