
Advokatfirmaet Thommessen AS is a key port of call for multinational and domestic clients on complex IP litigation involving patents, trade marks, and trade secrets. The firm has notable sector experience in the life sciences, oil and gas, and marine industries, and regularly advises on transactions and licensing matters requiring IP due diligence and regulatory insight. The practice is led by seasoned IP litigator Camilla Vislie, with Magnus Hauge Greaker, who has particular experience in pharmaceutical and oil-related disputes, and litigator Eirik W Raanes serving as key practitioners.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Sector knowledge
Client satisfaction: NPS ®
Testimonials
Collated independently by Legal 500 research team.
- ‘Eirik Raanes is the perfect trusted advisor in highly strategic IP matters, providing to-the-point practical legal advice.’
- ‘Their knowledge of the subject is sublime.’
- ‘I highly recommend Magnus Hauge Greaker for intellectual property matters. He has a great team supporting him, and he excels at identifying the clearest, most successful strategy — preferring to win the essential battles rather than fight everyone. His practical, strategic approach gives confidence and delivers results.’
- ‘The team covers all aspects of intellectual property law and provides efficient and high-quality advice throughout the field.’
- ‘The team provides excellent legal advice on the spot, perfectly adapted to the Norwegian legal challenges.’
Key clients
- Bristol-Myers Squibb
- BioMar AS
- TONO SA
- Novo Nordisk AS
- Equinor ASA
- Vianode AS
- Johnson&Johnson
- Janssen
- AutoStore AS
- Intervet International BV
- Philip Morris International
- Philip Morris Norway AS
Work highlights
Represented Bristol-Myers Squibb in the appeal case against Teva relating to the patent protecting Bristol-Myers Squibb's groundbreaking drug Eliquis® (apixaban).
Represented Optime Subsea in a patent dispute against Subsea Solutions AS relating to Optime's system for intervention and work-over of subsea wells.
Represented Janssen Biotech Inc. (Johnson & Johnson) in a patent dispute relating to Janssen's patent EP'606 protecting ustekinumab for use in ulcerative colitis.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.

Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Camilla Vislie
Other key lawyers
Eirik Raanes; Magnus Hauge Greaker
Comparative Guides
Comparative Guide
Private Equity
Norway
Hans Cappelen Arnesen, Christian Grüner Sagstad, Lars Eirik Gåseide Røsås & Øyvind Mork Karlsen
Comparative Guide
Patent Litigation
Norway
Camilla Vislie, Eirik W. Raanes, Magnus Hauge Greaker & Andreas Stabell
Comparative Guide
Tax
Norway
Marius Holm Rynning & Tobias Doeland Svinterud
Comparative Guide
Litigation
Norway
Per Ole Svor, Arne Hellesylt, Kristine Hyldmo Bjørnvik, Eirik W. Raanes & Nanette Arvesen

