The Firm: IAM 1000 - The World's Leading Patent Practicioners 2014 concludes: “The ultimate success story,” Reimann Osterrieth Köhler Haft has emerged in recent years as the undisputed champion of the Dusseldorf scene. “It has 10 times the number of cases than the next rival and nearly every significant law firm faced it at least once in 2013.” It recently promoted its first home-grown partner, Mirko Weinert – further evidence of its long-term success. “It is difficult to highlight any one individual at this firm, because they are all of such fine quality.” Stand-out players include  Klaus Haft , who “is recommended for his highly strategic method of handling cases, his exceptional communication skills and his absolutely perfect understanding of the interface of the technical and legal field. He takes a composed attitude to his work, which he carries out with precision. He is the very best.” One inhouse counsel reveals: “I have seen the quality of his product and he is just of an outstanding calibre. I am always trying to get him to come and work for me!” “When  Christian Osterrieth  wins, he wins big. Clients are delighted with his advice.” “Acknowledged master” Thomas W Reimann  “is the number to call when things get complicated. He is one of the leading lawyers in Germany – a pragmatic, seasoned, cross-border litigator”. Martin Köhler  “plays in the big league. He has every base covered – great business understanding, excellent technical and legal expertise – and he is very considerate and easy to work with on a personal level”. “Brilliant technically and tactically”, Tobias Hahn  “is a pleasure to deal with and a joy to work with”. One in-house counsel enthuses: “He has shown a technical understanding and willingness which I have not found anywhere else. Adding in his technical skills, he is a force to be reckoned with. I can recommend him without hesitation.” “Extremely talented lawyer” Kay N Kasper  “started from the top – his main task is to maintain this level”. Biotechnology sage  Christine Kanz  is a favourite of pharmaceutical companies.

Chambers Europe 2009 resumes: “An excellent IP boutique with a fantastic reputation in the telecoms world,” this firm has carved out a niche for itself in high-profile IP litigation, with a special emphasis on patent infringement disputes. ... Sources also note that the firm’s success in attracting high-quality new recruits has enabled it to “gather momentum of late and cement its profile as a dynamic national and global presence.”  IAM 250 adds in its 2011 edition: "The team's international firm background facilitates market-leading professional and international organisation". And Chambers Europe 2010 concludes: "A great choice for international IP work, and with good financial control – they always stick to budgets."

Correspondingly, the firm is top-ranked among Germany's leading patent litigation firms by Chambers Europe, Legal500, MIP, PLC, IAM (The world's leading life science patent litigation law firms), Juve and listed in In addition, the firms trademark and unfair competition practice is highly regarded among others in Managing Intellectual Property's World's IP Survey featuring the world's leading IP firms.


Who's Who Legal 2010: "Reimann Osterrieth Köhler Haft is the most highly regarded firm in Germany. Six lawyers are identified from the the firm from its offices in Düsseldorf."

The Lawyers: "This Duesseldorf based firm is recognised for its 'deeply experienced, internationally-savvy litigators" (IAM 2010). According to Chambers Europe, 2009, observers note: “The lawyers here know the law inside-out and understand the judges, making it a prime contender in this field - it has an enviable track record.” And Legal500 concludes in its 2010 edition: clients ‘fail to point out one bad lawyer in the team’.

With respect to Thomas W. Reimann "clients note that name partner Thomas W. Reimann, in particular, has an ‘ exceptional standing’ in the market, and ‘ sets an example for associates, trainees and future lawyers without displaying the need to show off’" (Legal500, 2008).

‘Creative’ (Legal500, 2010) Christian Osterrieth "really has his eyes on the ball" in patent law (Chambers Global, 2006) and is listed in The International Who's Who of Trademark Lawyers.

Martin Köhler is "highly rated as an expert in the electronical, mechanical engineering, automotive, pharmaceutical and medical technology sectors" (Chambers Europe, 2008),  ‘asking the right 
questions at the right moment’ (Legal500, 2010) 

Klaus Haft enjoys an "excellent reputation as an extremely focused, structured patent and design law expert with outstanding technical understanding.”  (Chambers Europe, 2009).

According to Chambers Europe 2008, "clients praise Christine Kanz's 'great knowledge in the pharmaceutical, chemical and biology sectors: as one client put it, she is intelligent, experienced, and understands all technical issues.” 

Kay N. Kasper is praised as "experienced litigator" e.g. by Legal500, 2010.

Thomas Schmitz and Mirko Weinert are frequently recommended by peers and in respective surveys.


"The lawyers are extremely user-friendly and used to the Anglo-Saxon way of doing things the firm has some of the best people for litigation in Germany." (Chambers Europe 2015)


Chambers Global 2015

Clients describe IP department head Thomas Reimann as a "very knowledgeable and experienced person." Of late he has been active co-ordinating international patent litigation at both a national and European level.

Interviewees single out leading lawyer Klaus Haft's technical background as one of his key attributes, noting: "I would say his most outstanding strength, from the point of view of a hi-tech company, is his dual education." Clients add: "He is outstanding. He is very attuned to a client's concerns, always thinks several steps ahead and is one of the best strategic thinkers in litigation. He zealously represents the client's interests, but is excellent at providing us with unbiased, candid advice."

Sources praise patent litigator Kay Kasper for his "excellent subject knowledge, high service level and practical advice." His broad experience spans a wide range of industries, from medical devices to packaging technologies.

Interviewees describe patent litigator Martin Köhler as an "outstanding technician, lawyer and entrepreneur at the same time." He is active in the electronics, mechanical engineering and pharmaceuticals sectors.

Christian Osterrieth attracts praise from interviewees for his "forensic" approach to detail and in-depth expertise in patent litigation proceedings. He has a particularly strong focus on the life sciences sector.