
Accolades
Testimonials
Collated independently by Legal 500 research team.
'The team delivers individual legal advice at the highest level and is able to react quickly and flexibly and adapt the strategy.'
'Super strategist: Hosea Haag creative and clever in his arguments. Jonathan Konietz: clever and quick to understand and willing to go the extra mile.'
'Small but very powerful team. Lots of relevant experience in patent infringement cases. Very responsive and pleasant to work with.'
'Hosea Haag is the most experienced partner on the team. He is well connected in the scene and has an excellent work ethic. Despite his status, he still works his way deeply into the cases himself.'
'Jonathan Konietz is a younger partner in the patent litigation team, but he already has a lot of relevant experience. Unlike many other lawyers in this area, he also aspires to understand all technical details of a case himself. He is happy to receive support from involved patent attorneys, but always with the aim of understanding and mastering all technical details himself, where necessary.'
'AMPERSAND Partnerschaft von Rechtsanwälten mbB is characterised by first-class services in intellectual property and patent law. The law firm has earned an excellent reputation and impresses with its expertise, professionalism and client-oriented approach.'
Key clients
- Arigna Technology Ltd.
- Brushgate Oy
- DT Swiss AG
- Ewikon
- ImberaTek LLC
- Intent IQ
- Onebutton
- Pantech Corporation
- Quiss Qualitäts-Inspektionssysteme und Service GmbH
- Unwired Planet
- Valutis GmbH
- Westfälische Wilhelms-Universität Münster, Universitätsklinikum Münster
Work highlights
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

Practice head
Hosea Haag
Other key lawyers
Jonathan Konietz