Our Law Firm

Our law firm is made up of four offices in Würzburg, Jena, Heilbronn and Nürnberg. The Würzburg office was founded by patent attorney Ragnar Gleim and attorney Dr. Lars Petri in 2014. In 2020, the opportunity arose to take over the renowned patent law firm Oehmke und Kollegen from Jena. At the same time, patent attorney Dr. Peter Käckell, previously a partner at Geyer, Fehners & Partner, joined our firm.
On July 1, 2023, we merged with the long-established Heilbronn-based patent law firm Müller/Clemens/Hach, and on January 1, 2025, we took over the Stippl Patentanwälte law firm in Nuremberg.
Team photo of the 4IP law firm

„To think means to compare“ (Walther Rathenau)

We are not afraid of comparison - but nobody can do everything. That’s why we only do what we are really good at! Our core business is the worldwide registration and enforcement of industrial property rights such as patents, trademarks and designs. We also advise on the contractual aspects of these intellectual property rights, for example on the drafting of license agreements or research and development agreements, but also on distribution agreements and competition, copyright and employee invention law.

We have experience. We advise the world’s leading companies on building an effective IP portfolio and develop patent, trademark and design strategies that precisely match the interests of our clients. Different clients have different interests. We know that.

Compromises are good - but not always the ideal solution. Careless settlements and easy compliance jeopardise your competitive position in the long run. We have special expertise in the judicial enforcement of claims under patent, trademark, design, competition and contract law. We know what makes your opponent tick and we know the courts.

Legal work costs money. And you have to talk about money. As a rule, we work on the basis of remuneration agreements; fixed prices can also be agreed for certain projects. Before we start our work, we calculate the costs as precisely as possible. Everyone should know where they stand and in a good client relationship there is no arguing about money.

We look forward to hearing from you!

Our Attorneys

Portrait of Michaela Gilch

Michaela Gilch is an Attorney-at-Law, Expert Attorney for intellectual property law with an additional qualification as Economic Lawyer (Wirtschaftsjuristin, University of Bayreuth). She studied law at the University of Bayreuth with a focus on intellectual property law. At the same time, she completed additional training in economics. Following her first state examination, she completed her doctorate as part of the DFG Research Training Group titled ‘Intellectual Property and Public Domain’. Her thesis on a patent-law-related topic is about to be finalized. During her doctoral studies and her legal clerkship at the Higher Regional Court of Bamberg, she worked as a research assistant in various law firms in the field of intellectual property law. Her professional focus lies on judicial and extrajudicial enforcement of intellectual property rights in patent, trademark and design law as well as providing consultancy on the registration of trademarks and designs. She also focusses on drafting of contracts and providing consultancy on employee invention law.

Portrait of Ragnar Gleim

Ragnar Gleim is a German patent attorney and European Patent, Trademark and Design Attorney. His studies in physics in Würzburg and Edinburgh provide the necessary technical basis for his technically multifarious activities. He acquired the necessary legal qualifications for his activity as a patent attorney by way of his training as a patent attorney at the law firm advotec in Würzburg, which he completed with a stint at the law firm PIPERS in New Zealand. During his professional work as a patent attorney at the Basel law firm BOHEST in Switzerland, he gained a deep understanding of the different requirements in association with international patent proceedings in various jurisdictions. Supporting clients in a wide range of technical fields, from the electrical industry, mechanical engineering and software manufacturers to pharmaceutical giants, gives him the opportunity to provide consultancy to clients tailored to their specific technical needs. His legal specialization lies in the areas of patent and utility model law. One of his main areas of interest is employee invention law. Ragnar Gleim was appointed to the examination board for patent attorneys.

Portrait of Dr. Peter Käckell

Dr. Peter Käckell is a German Patent Attorney, European Trademark and Design Attorney and European Patent Attorney. The technical foundations were laid with a degree in physics at the Technical University of Berlin, a subsequent doctorate at the Friedrich Schiller University in Jena and a two-year stay at the Joint Research Centre for Atom Technology/National Institute for Advanced Interdisciplinary Research in Tsukuba, Japan. He learnt the tools of the legal trade during his training at the law firm Geyer, Fehners & Partner in Jena and Munich. He has many years of extensive professional experience in patent, utility model, trademark and design law as well as employee invention law, with a legal focus on the granting and enforcement of technical property rights and the defense against unjustified third-party claims. In the technical field, his main focus lies in the areas of optics, information technology and concrete processing as well as products for logistics. He is also a lecturer at the Ernst Abbe University in Jena on the ‘Patent Engineer’ Master’s programme. Dr. Peter Käckell is a partner at the law firm.

Portrait of Stella Langer

Stella Langer studied law at Julius Maximilians University of Würzburg and successfully passed the First State Examination in Law (Dipl.-Jur. Univ.) in 2022. She is currently a legal trainee at the Higher Regional Court of Bamberg.

Stella Langer has been working in our law firm since October 2021. As a research assistant, she is extensively involved in the legal handling of intellectual property right infringements and competition law violations. She specialises in the field of trademark law.

Portrait of Stefan Noack

Stefan Noack is a German patent attorney and European Patent, Trademark and Design Attorney. After completing his Master’s degree in Physics (M.Sc.) at Friedrich Schiller University Jena, he worked for several years as IP Manager at a fast-growing start-up in the field of robotic surgery. There, he contributed to establishing and implementing IP and innovation processes, completed a part-time degree in Patent Engineering (M.Eng.) at Ernst Abbe University of Applied Sciences Jena, and ultimately headed the IP department.

Stefan Noack received his training at our law firm before being admitted as a German patent attorney in 2024. He advises clients primarily on matters relating to patent, trademark and design law, as well as employee invention law. In terms of his technical expertise, he works, among other areas, in the fields of medical technology, mechanical engineering and electrical engineering. He has a particular interest in the development of IP strategies.

Portrait of Dr. Lars Petri

Dr. Lars Petri is an Attorney-at-Law and Expert Attorney for intellectual property law. He completed his doctorate at the Kurt Haertel Institute for the Protection of Intellectual Property on a patent-law-related topic. After his first professional years in a renowned patent attorney and law firm in the Rhineland, he took over the management of the legal department of one of the leading patent and law firms in Bavaria. He has many years of professional experience in the registration of trademarks and designs and the extrajudicial and, above all, judicial enforcement of property rights, competition and contract law claims. He also specializes in drafting and reviewing licensing and research & development agreements. He is the author of numerous publications on patent law, trademark law and license agreement law and holds lectureships in trademark and media law at the Julius-Maximilians-University of Würzburg and the University of Würzburg-Schweinfurt.

Research Associates

Portrait of Mona Löther

Mona Löther studied at Julius Maximilians Universität of Würzburg and graduated with a master’s degree in physics. She already worked as a research assistant at our law firm during her studies.

With the aim of being admitted as a patent attorney candidate, she is now completing a year of practical technical work.

Portrait of Dr. Raul Stühler

Dr. Raul Stühler holds a doctorate in physics. He is currently completing his training as a German and European patent attorney. His successfully completed studies in physics and his subsequent doctorate in the field of solid state and semiconductor physics at the University of Würzburg form the broad foundation of his daily work with technically sophisticated inventions.

Following his doctorate, Raul Stühler gained valuable experience as a Senior R&D Specialist in an industrial research department of the chemical and pharmaceutical company Merck KGaA in Darmstadt. In an interdisciplinary team of physicists, chemists, material scientists and engineers, he worked on the development of highly efficient organic light-emitting diodes (OLEDs).

By working for several years as a patent engineer alongside his doctorate, Raul Stühler learned how to draft patent applications and defend them in examination proceedings before national and international patent offices. In his current role as a patent attorney candidate, he is deepening these skills and acquiring legal knowledge by studying law for patent attorneys at the Fernuniversität in Hagen.

Team

Portrait of Michaela Aulbach
Michaela Aulbach
Patent paralegal and legal assistant
Portrait of Franziska Ebersberger
Franziska Ebersberger
Patent paralegal and legal assistant
Portrait of Barbara Freller
Barbara Freller
Trainee
Portrait of Saskia Fröbe
Saskia Fröbe
Trainee
Portrait of Carolin Gehrsitz
Carolin Gehrsitz
Geprüfte Wirtschaftsfachwirtin (IHK)
Patent paralegal and legal assistant
Portrait of Shireen Hache
Shireen Hache
Patent paralegal
Portrait of Jessica Klenz
Jessica Klenz
Patent paralegal
Portrait of Marion Langer
Marion Langer
Patent paralegal
Portrait of Sabine Loidold
Sabine Loidold
Office assistant
Portrait of Jeanette Neumann
Jeanette Neumann
Patent paralegal and legal assistant
Portrait of Angela Selsam
Angela Selsam
Patent paralegal
Portrait of Sandra Spies
Sandra Spies
Patent paralegal
Portrait of Thérése Weiler
Thérése Weiler
Rechtsanwaltsfachangestellte