The Firm: The firm's "fantastically strong" (Legal500, 2008) patent litigation practice provides a ‘first-class service level’ (Legal500, 2010) and is praised for "its great expertise and experience in patent infringement disputes and employee invention law matters" (Chambers Europe, 2008) as well as for its “excellent national and international network with other law firms and patent agents", allowing the firm "to handle large complex domestic and cross-border patent litigations in the technology, biotech and pharmaceutical sectors" (Chambers Europe, 2008). Legal500, 2010: "The practice does a considerable amount of work for international clients, who appreciate the ‘reliable, quick and in-depth’ advice."

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.