Patent Attorneys and Attorneys at Law

Your Partner for Intellectual Property (IP)

IP – Why?

Find out why intellectual property can be important for you and what advantages it offers.


We regularly publish up-to-date information on intellectual property and developments of our law firm.

Coming soon

IP, Your Advantages

Intellectual property rights are territorial prohibiting rights. You can therefore prohibit third parties from engaging in any activity based on your intellectual property rights in a country in which you have a prohibiting right, such as the use of your trademark or the manufacture and sale of products protected by a patent or registered design.

In addition, own intellectual property rights can be helpful if you are attacked based on intellectual property rights of a third party. Instead of a possibly protracted and expensive legal dispute, own intellectual property rights offer the possibility to bring them into out-of-court negotiations, for example in order to negotiate a mutual license.

Furthermore, own intellectual property property rights can be an indicator for particularly innovative companies and can be recognized in their value.


We would be please to provide you with our counsel in a comprehensible and profound manner

for general questions regarding intellectual property rights or a specific case.

Please contact us

Fields of Law that we comprehensively cover

Patent Law
Trademark Law
Design Law
German Employee Invention Act
Licence Rights
Fair Trade Law
Border Seizure

We are committed to obtaining your intellectual property rights before the world's patent and trademark offices. In the event of trials in court, we defend your rights before arbitration boards, the Federal Patent Court as well as before ordinary courts up to the Federal Supreme Court.

Areas of Technology that are part of core competences

Renewable Energy
Electrical Engineering
Material Science
Life Science / Pharmaceuticals
Software/ CII
Medical Technology

We are there when you need us

whether individual inventor or global player.

Please contact us

At home in Berlin, active for you worldwide

In addition to our specialized patent attorneys and attorneys-at-law, highly qualified staff, in particular patent engineers and scientists, patent specialists, technical draftsmen and translators work for us. We cooperate with partners in practically every country in the world and have developed very successfully over the years. Beyond the traditional fields of technology, we have acquired an excellent reputation in the special fields of chemistry, biotechnology, pharmacy, medical technology, precision engineering and engineering.

The professionals working for ETL IP are authorized to assert your interests in the field of intellectual property rights both before the GPTO (German Patent and Trade Mark Office) throughout Germany and before the EPO (European Patent Office) throughout Europe. We also represent clients in international patent applications before the WIPO (World Intellectual Property Organization). In the field of trademarks and designs, our power of representation extends not only to the territory of Germany and the EU but also to the WIPO member states, i.e. almost worldwide.

Dipl.-Phys.Ing. Ingo Ludwig

Dipl.-Phys.Ing. Ingo Ludwig

European Patent Attorney

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Dietrich Rüdiger Loll

Dietrich Rüdiger Loll

Attorney at Law, Tax consultant


Origins of the firm

In 1980, the firm was founded by Prof. Dr. Dr. Wablat.

In 1990, the firm merged to form Wablat Lange Karthaus, so that it was now represented nationwide. In addition, with the enlargement and accession of further patent attorneys, the range of services could be broadened.

The team was rejuvenated with the integration into the ETL Group in October 2018. Dr. Diana Taubert and Ingo Ludwig became in addition to the founder Prof. Dr. Dr. Wablat central contacts and decision makers.

About us

Dr. Dipl.-Chem. Diana Taubert, Patent Attorney


  • since 2018: general manager with ETL IP
  • 2016-2018: acting as patent attorney
  • seit 2016: German patent attorney, European patent trademark and design attorney
  • 2013-2015: qualifying in German and European intellectual property law
  • 2008-2013: qualifying in German and European intellectual property law

Professional Focus

  • German, European and international patent, trademark and design law
  • German Employee Invention Act
  • License rights

Technical Focus

Semiconductors, fuel cells, exhaust gas technology, machine engineering, process engineering, medical technology, chemistry, nanotechnology, material sciences, vehicle batteries, office equipment, sports equipment

About us

Dipl.-Phys.Ing. Ingo Ludwig, European Patent Attorney


  • since 2018: at the ETL Group
  • 2012-2018: working as European Patent Attorney for law firms in Germany and Switzerland
  • since 2012: professional representative before the European Patent Office / European Patent Attorney
  • 2007-2012: qualifying in intellectual property law
  • 1997-2007: project manager in research and development with global players and medium-sized companies

Professional Focus

  • European patent law
  • international patent law
  • patent law abroad, in particular in the USA, China, Japan, Kora

Technical Focus

mechanical engineering, electrical engineering, physics, process engineering, software (CII), medical engineering, data storage devices, digital interfaces, high pressure discharge lamps, LCDs, automotive batteries, ultrasonic used in processing and detection, smart consumption meters, graphical user interfaces, catheters, pace makers, office equipment, sports equipment

About us

Günther Furchtbar, Attorney at Law


  • since 2018: general manager with ETL IP
  • 2009-2018: freelancer as attorney with law at law firm Wablat Lange Karthaus
  • 2008-2012: alternating chairperson of MDK Berlin-Brandenburg directorate
  • 2001-2006: alternating chairperson of the company health insurance funds directorate of the BMW AG
  • 1996-2010: honorary judge with the German Federal Labor Court
  • 1995-2001: member of the board of examiners of the JPA for the second bar exam in labor law
  • 1991-2001: head of human resource management, social affairs and organization with BMW Motorrad und Werk Berlin der BMW AG
  • 1974-1991: Various managerial positions and lectureships
  • 1974: second bar exam at the Higher Regional Court Düsseldorf
  • 1965-1970: studying of jurisprudence and governance policy at the universities of Bonn, Lausanne and Geneva

In co-operation with

ETL Rechtsanwälte

Do you have questions or comments? Please contact us!

Do you need assistance in obtaining or enforcing intellectual property rights, do you have questions on intellectual property rights or a general inquiry?

Write to us or give us a call. We look forward to your inquiry.

Patent- und Rechtsanwaltsgesellschaft mbH
Clayallee 343
14169 Berlin

Phone: +49 30 804 894 0
Facsimile: +49 30 804 022 06

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