Andreas Oser

Managing Partner at Prufer & Partner
Ranked in Germany
IAM Research

The Patent 1000 focuses exclusively on patent practice and has firmly established itself as the definitive 'go-to' resource for those seeking world-class legal patent expertise.

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“Prüfer & Partner provides results-oriented solutions, responds to clients’ needs quickly and appropriately, and demonstrates a strong ability to understand and analyse both legal and technical issues – overall, an excellent service.” Over the past 12 months it has continued to provide longstanding client Novartis and baking oven innovator Wachtel with on-point strategic advice; and processed a high volume of patent applications across multiple jurisdictions for Knorr-Bremse Systeme für Schienenfahrzeuge in relation to truck and rail braking and maintenance systems. Leading on the Novartis brief is Andreas Oser, who holds a PhD from the Max Planck Institute for Biochemistry; while the latter two mandates are handled by Jürgen Feldmeier a mechanical engineer who has participated in more than 100 contentious actions during almost 30 years at the patent coalface. Both serve as managing partners of the firm, alongside Dorothea Hofer and Andreas Jacob. Responsible for the group’s ongoing relationship with medical implants leader SME Biederman Technologies, physicist Hofer “has a broad understanding of complicated technical matters and always puts together the most appropriate team for the job”. Attorney at law Jacob earns praise for his “agile project management, strong leadership and timely derivation of effective measures”.

Andreas Oser's Profile

Andreas Oser has been working in the IP field since 1991; he became a German and European patent attorney in 1995 and has been managing partner at Prüfer & Partner since 2002.

Prior to working in intellectual property, he studied chemistry at the University of Freiburg in Breisgau, and then conducted his PhD and postdoc studies at the Max Planck Institute for Biochemistry in Munich. He also holds an LLM degree in international IP laws from the University of Hagen.

Dr Oser’s primary areas of expertise are chemistry, pharmaceuticals, life sciences and biotechnology – in particular, biological materials, DNA-related inventions and vaccines; therapeutic and diagnostic methods; medical products and devices, and targeted drug delivery; polymers and fibre materials; semiconductors, LEDs, OLEDs and other optical materials and optoelectronic devices; and batteries and their components.

His activities include patent prosecution (drafting, examination); a high number of opposition and appeal proceedings at the European Patent Office; patent litigation (patent infringement proceedings before German courts; nullity proceedings up to the highest instance, the Federal Supreme Court; also covering coordinated and complex EU-wide litigation activities); infringement and validity opinions; freedom-to-operate analyses; and due diligence.

Dr Oser is heavily involved in numerous litigation cases, among others related to medical devices and important drug products.

Firm Profile

Prüfer & Partner mbB is one of Germany’s most renowned IP law firms. It protects clients’ ideas, inventions and product developments around the world and enforces their claims in court – whether technical inventions or other IP rights. Today, nearly 70 employees – including 23 patent attorneys, attorneys at law and patent specialists – work for this IP boutique.

Prüfer & Partner was founded in 1972 by patent attorney, physicist and master optician Lutz H Prüfer as a pure patent attorneys’ office, which quickly developed into an internationally focused medium-sized law firm specialising in IP law. A successful generation change took place between 1998 and 2002 when Prüfer & Partner was taken over by patent attorneys Dorothea Hofer, Jürgen Feldmeier and Andreas Oser. A further milestone was reached in 2015 with the addition of attorney at law Andreas Jacob as an equity partner; the firm has since fully absorbed his legal know-how by developing the patent and legal service and thus ensuring its continuity.

As a result, Prüfer & Partner is an established and highly respected medium-sized law firm with a stable global network of partners, which advises clients on IP rights registration; supports clients in all issues relating to IP rights protection; and defends and enforces clients’ IP rights in court.

With Prüfer & Partner, you can expect a strong and carefully selected community of patent attorneys, lawyers and technical specialists. The firm represents its clients’ interests at the highest level. Prüfer & Partner is familiar with complex and demanding mandates and works with great commitment.

Diligence and expertise play an important role in industrial property law protection. Prüfer & Partner patent attorneys and lawyers work strictly to German quality standards: thorough, punctual and cost-efficient.

Over the past 10 years, Prüfer & Partner has continuously expanded its expertise in patent and trademark litigation. Dr Hofer and Mr Feldmeier have been advising their client Brother Industries for years in a complex patent dispute concerning ink cartridges. Dr Oser supports the pharmaceutical industry, including assisting Novartis with building up its patent portfolio. Mr Jacob is active not only in patent and trademark litigation before the German courts, but also in international disputes, particularly in China-related cases. Other Prüfer & Partner attorneys, including Christian Einsel, also regularly litigate both active and passive patent lawsuits. In addition, Marion Ziliox works for French and Asian clients, among others, in customs actions at the EU borders. As a result, Prüfer & Partner has extensive expertise across the entire IP field.

In addition, Prüfer & Partner has a well-established desk in China and continuously cultivates its business in China and other Asian countries – in particular Japan.

Looking to the future, Prüfer & Partner plans to both consolidate and broaden its activities in Germany to serve German and European clients, in particular small and medium-sized enterprises and start-ups, helping them protect their innovations and strengthen their position in an increasingly competitive market.

Located in Munich, the German heart of intellectual property, Prüfer & Partner is dedicated to serving its clients as a one-stop-shop IP boutique.

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