While oil and gas still accounts for a substantial portion of the Norwegian economy, the country and its inventors are also making a significant contribution to the global shift towards renewables. As a result, alternative energy sources such as offshore wind power and hydropower are generating a buzz among patent practitioners, who have seen an uptick in applications for green technologies. The pharmaceutical industry is another major source of work for patent attorneys and attorneys at law alike, as filings relating to treatment methods and medical equipment increase and more disputes between originators and generics come before the courts. On the administrative front, effective as of 1 July 2019, the Patent Act has been amended in an attempt to simplify the regime and enhance international harmonisation. Among other things, the deadline for requesting re-establishment where patents lapse due to non-payment of renewal fees has been extended – a change that has been welcomed by rights holders.

Firms: litigation and transactions

  • Advokatfirmaet BAHR AS
  • Advokatfirmaet GjessingReimers AS
  • Advokatfirmaet Haavind AS
  • Advokatfirmaet Thommessen AS
  • Kvale Advokatfirma
  • Schjødt
  • Wikborg Rein
  • Arntzen de Besche Advokatfirma AS

Firms: prosecution

  • Highly recommended
  • Håmsø Patentbyrå AS
  • Onsagers AS
  • Protector IP AS
  • Recommended
  • Acapo AS
  • Bryn Aarflot AS
  • Zacco 

Acapo AS

Operating out of Norway’s four major cities – Oslo, Bergen, Trondheim and Fredrikstad – Acapo has been providing seamless, easily accessible prosecution services across the country and beyond for almost a century. Its triad of stars – Gunnar Nilsen Søndersrød, Katja Reitan and Bodil Sollie Hjelsvold – “always keep clients looped in, resulting in high-quality and detailed work”. Nilsen Søndersrød is a mechanical engineering maven with an impressive résumé, which includes a stint as an examiner at the Norwegian Industrial Property Office (NIPO) and as in-house counsel. “For pharmaceutical patent matters, there are few better than Reitan. Proactive and thorough, she is also extremely knowledgeable about European Patent Office (EPO) case law and gets perfect strategies down on paper.” Patrons include Sandoz and Mylan. IAM Patent 1000 debutant Sollie Hjelsvold “takes a hands-on and holistic approach. She is really focused on providing the best advice possible, looking to identify relevant issues quickly and aligning her advice with a company’s wider business objectives”.

Advokatfirmaet BAHR AS

“Top-tier firm” BAHR is scarcely rivalled in terms of both the magnitude of the disputes it takes on and the results it delivers. Rights holders can rest assured when Are Stenvik is fighting their corner: the crack litigator receives praise from all corners of the market. “Solutions oriented and exceptionally skilled, Are is a source of inspiration to IP practitioners. He does not hesitate to delve into the technicalities of each case and is a pleasure to have on your side.” He links up with Gunnar Sørlie – another tenacious courtroom advocate with four decades of experience under his belt – to bring heavy-duty cases to a favourable close. They recently represented Novartis in a matter that raised fundamental questions concerning the validity of supplementary protection certificates.

Advokatfirmaet GjessingReimers AS

“GjessingReimers is the firm to watch and the team it has stacked up is set to make a mark on the patent world.” Since its establishment in 2019, it has been making waves in high-stakes litigation across the board – not least through the efforts of co-founding partner Ida Gjessing. “Vastly talented and creative, she digs deep into each case to achieve the best outcome for the companies she assists.” Gjessing also knows how to get commercially sound deals done in the life sciences and medical technology sectors. Adding further firepower are Sigrid Toft Fløystad and Amund Brede Svendsen. Toft Fløystad’s former role as general counsel for consumer brand supplier TINE gives her a keen understanding of client needs and expectations. Svendsen’s astonishing command of eight languages – including German and French – makes him the perfect choice for pan-European proceedings.

Advokatfirmaet Haavind AS

When push comes to shove, there is no firm that life sciences or marine industry players would rather have on their side than Haavind – its outstanding performances have earned it the loyalty of A-listers such as Sandoz and STIM. Serving as trusted counsel to both is Vebjørn Iversen, who leads the IP practice with verve. He splits his time between enforcing rights and getting signatures on the bottom line of lucrative licensing deals. Joining him is Håkon Bleken – this Supreme Court-admitted lawyer is an artful persuader with a passion for his craft.

Advokatfirmaet Thommessen AS

Well versed in the country’s key business sectors – pharmaceuticals, aquaculture and energy – the full-service Thommessen is a premier choice for multifaceted patent briefs. Camilla Vislie, Magnus Hauge Greaker and Eirik Raanes are the best litigators on the team sheet. Captaining the squad, “Vislie is brilliant all round and thrives when under the pump. She is a strong advocate and widely respected in the market”. She and Greaker often pair up, recently assisting Teva in its appeal against Mylan and defending BioMar in a spat with Europharma. Greaker also teamed up with Raanes to provide Eli Lilly with robust support in patent invalidation proceedings. Enforcement guru Raanes is also a dab hand in transactional scenarios, having recently guided Kongsberg Gruppen through its acquisition of Rolls-Royce Marine.

Arntzen de Besche Advokatfirma AS

Arntzen de Besche maintains a razor-sharp focus on oil and gas and life sciences, and is always alive to the wider commercial realities – an approach that is reflected in the output of Andreas Nordby. The former higher executive officer of the Legislation Department at the Norwegian Ministry of Justice has an intimate knowledge of national laws and proceedings, which stood him in good stead when assisting Smart Reamer Drilling on infringement and abuse of trade secret claims against four separate entities. The set’s transactional prowess was bolstered when Tommy Dahlen came back on board after a year in-house at oil production company OKEA. “Dahlen is extremely valuable as an adviser due to his understanding of technology and his ability to simplify processes into strategies that secure momentum. He always looks to add value and find creative solutions that bring about successful outcomes in a swift and efficient way.”

Bryn Aarflot AS

Covering all bases with its A-to-Z patent offering, Bryn Aarflot continues to go from strength to strength each year. Its well-connected crew of lawyers and European patent attorneys dispenses “hands-on, practical guidance that fits the bill at any stage of the lifecycle”. Providing inspired leadership is Kristine Rekdal, whose electronics know-how enables her to construct portfolios that will stand the test of time. As a frequent expert judge at the Oslo District and Appeal Courts, Redkal also has unique insight into the workings of the judiciary. The outfit has recently seen an uptick in life sciences instructions, which have been snapped up by organic chemist Marianne Weiby Wulff. She enters the IAM Patent 1000 this year along with former senior fellow with the Data Division at CERN Gisle Johan Midttun. The nuclear physics whizz is a “top prosecutor” who “gets into the nitty-gritty of each application he drafts. He is an excellent source for third-party opinions too”.

Håmsø Patentbyrå AS

Headquartered in Stavanger, a hotbed of innovation, Håmsø attracts a wide variety of instructions through its doors, but shines brightest in the oil and gas industry. With over 30 practitioners, most of whom have spent time in-house and come armed with PhDs, it makes light work of the trickiest of applications. Department spearhead Krister Mangersnes “provides great value to clients. His technical insight is superb and the final product is outstanding. He also facilitates communication between legal representatives, which optimises the flow of work and information”. Mangersnes recently prevailed on behalf of Westcon Power and Automation before NIPO, successfully invalidating a European patent belonging to ABB which had already been granted in major markets worldwide. European patent attorneys Jørgen Risdal and Steven Van Dijk have the Midas touch when taking applications through to grant. Risdal’s extensive background in agricultural machinery ensures he speaks the language of innovators; while former Philips man Van Dijk knows all the ins and outs of microelectromechanical systems and semiconductors, as well as technologies in the electronics and mechanics sectors.

Kvale Advokatfirma

A haven for rights holders seeking decisive patent enforcement, Kvale puts its heart and soul into every mandate, achieving stellar outcomes in the process. Pharmaceuticals is a forte – and an area in which board chair Anne Marie Sejersted and Ingvild Hanssen-Bauer often blow the opposition out of the water. The dynamic duo recently brought the heat for Mylan and Synthon in a dispute with Yeda, and for Sandoz in litigation with Biogen. “Sejersted’s proactive approach is brilliant. Her advice is clear, timely and achieves the best results. She handles her briefs smoothly and ensures she is always aligned with the overall business strategy.” Hanssen-Bauer “is consistently great. Her pleadings are thorough and she is one of the best in the game”. Marie Vaale-Hallberg fuses knowledge of the regulated industries with IP and marketing law expertise in a blend that is tough to beat in any transactional setting.

Onsagers AS

“A one-stop shop for IP services, Onsagers certainly impresses.” Home to European patent attorneys, PhDs and former NIPO researchers, it puts together tailored, industry-focused units to ensure that its prosecution services are never less than first rate. With over two decades of experience in the life sciences, Kari Simonsen is always on the ball. The former NIPO senior examiner understands the key to a good application and offers robust support in infringement proceedings. In a similar vein, pharmaceutical buff and IAM Patent 1000 newcomer Kim Livgard has also served as an examiner and dispenses sage advice on infringements, validity and freedom to operate. Chemical engineer “Dorte Lajer possesses outstanding technical expertise”. Having guided start-ups, small and medium-sized companies and multinational corporations, she knows which stones to turn to find the optimal solutions. Previously an R&D engineer and corporate patent counsel at ABB, Per Reiner has a real affinity for power generation and transmission technologies, which he draws on when representing companies from these sectors before the EPO.

Protector IP AS

The prosecution offering at Protector IP is as dynamic and innovative as the outfit’s clientele. It provides shrewd advice laced with commercial insight to help clients stake out and protect competitive market positions. Mechanical engineer Arild Tofting brings over two decades in the game to bear on every brief and never settles for a cookie-cutter approach. His forte is offshore technology; while colleague Bjarne Coward excels in petrochemistry. From IP due diligence assignments to assistance in legal proceedings, Coward can always be relied upon to deliver. A former adviser at the Norwegian Society of Engineers and Technologists and executive officer at the NIPO, Anne-Gro Bildoe Imset brings a multi-dimensional approach to all instructions that crosses her desk.


A safe pair of hands for must-win cross-border disputes, Schjødt has enjoyed a red-letter year thanks to the assured courtroom performances of its seasoned litigators. As an example, head of the IP and dispute resolution practices Halvor Manshaus was pivotal in securing full legal costs, damages and an injunction for Elopak in a clash with Tetra Pak which will not only affect its status on the domestic market, but also reverberate throughout the carton sector as a whole. The Supreme Court-admitted Sigurd Holter Torp is another doughty champion of clients’ rights and interests, who has handled cases involving everything from intellectual property to contract law and even white collar crime. “Knut Sverre Skurdal Andresen’s attention to detail, courtroom advocacy, client responsiveness and thoughtfulness are first class”; he recently joined from BAHR.

Wikborg Rein

With bases in Oslo, Bergen, London and Singapore, as well as a representative office in Shanghai, Wikborg Rein has impressive geographic reach, making it a favourite for those seeking dispute resolution services on an international scale. First among equals at the firm is Gunnar Meyer, “a well-known market figure and one of the best litigators in Norway. He will jump through hoops for his clients and you can tell how experienced and wise he is from the way he communicates and prepares for court”.


Growth is the watchword at full-service consultancy Zacco, whose ever-increasing headcount currently sits at over 500 across 32 offices in six countries. It consistently keeps up to speed with cutting-edge advancements, as reflected in its recent focus on global digitalisation and artificial intelligence. Under the stewardship of Hans Langan and Anne Sønstevold, the prosecution shop is thriving, leveraging the technical and geographical capabilities on offer to execute varied instructions from all corners of the world. “Creative and fun to work with”, mechanical engineer Langan knows his way around the drawing board and devises patenting strategies that maximise the chances of success. As a former research scientist in the healthcare field, Sønstevold can explain the most complex details in a way that the C-suite understands.

Other recommended experts

Based at Kluge Advokatfirma, Kyrre Andersen “is the next big name in patent disputes. He is exceptionally talented and has a staggering track record of success”. Oil and gas is his specialty.

Individuals: litigation

  • Ida Gjessing - Advokatfirmaet GjessingReimers AS
  • Halvor Manshaus - Schjødt
  • Gunnar Meyer - Wikborg Rein
  • Gunnar Sørlie - Advokatfirmaet BAHR AS
  • Are Stenvik - Advokatfirmaet BAHR AS
  • Ingvild Hanssen-Bauer - Kvale Advokatfirma
  • Anne Marie Sejersted - Kvale Advokatfirma
  • Camilla Vislie - Advokatfirmaet Thommessen AS
  • Kyrre Andersen - Kluge Advokatfirma DA
  • Håkon Bleken - Advokatfirmaet Haavind AS
  • Magnus Hauge Greaker - Advokatfirmaet Thommessen AS
  • Sigurd Holter Torp - Schjødt
  • Vebjørn K Iversen - Advokatfirmaet Haavind AS
  • Andreas Nordby - Arntzen de Besche Advokatfirma AS
  • Eirik W Raanes - Advokatfirmaet Thommessen AS
  • Knut Sverre Skurdal Andresen - Schjødt
  • Amund Brede Svendsen - Advokatfirmaet GjessingReimers AS
  • Sigrid Toft Fløystad - Advokatfirmaet GjessingReimers AS

Individuals: prosecution

  • Anne-Gro Bildoe Imset - Protector IP AS
  • Bjarne G Coward - Protector IP AS
  • Gisle Johan Midttun - Bryn Aarflot AS
  • Dorte Lajer - Onsagers AS
  • Hans Langan - Zacco 
  • Kim Livgard - Onsagers AS
  • Krister Mangersnes - Håmsø Patentbyrå AS
  • Gunnar Nilsen Søndersrød - Acapo AS
  • Per Reiner - Onsagers AS
  • Katja Reitan - Acapo AS
  • Kristine Rekdal - Bryn Aarflot AS
  • Jørgen Risdal - Håmsø Patentbyrå AS
  • Kari Simonsen - Onsagers AS
  • Bodil Sollie Hjelsvold - Acapo AS
  • Anne Sønstevold - Zacco 
  • Arild Tofting - Protector IP AS
  • Steven Van Dijk - Håmsø Patentbyrå AS
  • Marianne Weiby Wulff - Bryn Aarflot AS

Individuals: transactions

  • Tommy Dahlen - Arntzen de Besche Advokatfirma AS
  • Ida Gjessing - Advokatfirmaet GjessingReimers AS
  • Halvor Manshaus - Schjødt
  • Gunnar Meyer - Wikborg Rein
  • Andreas Nordby - Arntzen de Besche Advokatfirma AS
  • Anne Marie Sejersted - Kvale Advokatfirma
  • Are Stenvik - Advokatfirmaet BAHR AS
  • Marie Vaale-Hallberg - Kvale Advokatfirma