Ida Gjessing


Ida Gjessing is a litigator with a focus on patent and trademark cases. On the non-contentious side she provides advice on all aspects of IP law, including designs and copyrights, research ethics and marketing law. She chairs the Council dealing with Unfair Marketing Practices (NKU).


Rankings and recognitions

  • Top ranked in IP Chambers Global and Chambers Europe 2018, 2019, 2020 and 2021:


  • 2021: “Ida Gjessing is a highly acclaimed patent and trade mark litigator, acting for clients from the pharmaceutical, aquaculture, and food and beverage sectors. One client enthuses that she is «an excellent advocate in court who is able to present your case the way you would want it to be presented, particularly with respect to technical and complex matters.»


  • 2020: “Ida Gjessing is lauded by clients as «one of the top IP litigators in Norway». She is highly regarded for her work on copyright, trade mark and patent disputes. Gjessing frequently acts for clients in the pharmaceutical and manufacturing sectors.”


  • 2019:” Ida Gjessing is highly experienced in patent, copyright and trade mark disputes. One impressed client lauds her insight as a key strength, reporting that «she quickly cuts to the core of the matter.»


  • 2018: “Ida Gjessing specialises in a wide range of IP matters including patents, trade marks and copyright. She also have extensive experience in marketing and advertising law. Clients say: “She is truly outstanding. She cuts to the core of the case very quickly and is very good at presenting complex matters. She is responsive and fun to work with.”


  • Leading individual in Legal500 2018, 2019, 2020 and 2021:
  • 2021: “Ida Gjessing was excellent and clearly very knowledgeable in the area of artwork commissioning.”
  • 2020: “Ida Gjessing is a star litigator.”


  • Top ranked IAM Patents 2020


  • Top ranked WTR 1000 2020


  • MIP IP Stars: Patent star 2020/2021, Trade mark star 2020/2021, Top 250 Women in IP 2020


  • Who’s who legal: Life Sciences – Patent Litigation 2021, Patents 2020, Trademarks 2020


Litigating patents and SPCs (pharmaceutical, biosimilars and veterinary patents, aquaculture, oil and gas services industry), trademarks (all sectors). Advising clients on the aforesaid matters, and on contractual and regulatory matters, across all sectors.


Partner, GjessingReimers2019-
Partner, Grette2007-2019
Attorney, Advokatfirmaet Wiersholm
Attorney, Nycomed Amersham1997-1999
Deputy Judge, Jæren District Court1996-1997
Trainee at the Court of Justice of the European Communities
Associate, the Office of the City Advocate in Oslo


Lawyers' practising certificate
Master of Laws, University of Oslo1993
Studies in legal philosophy, EU law and German business law at Christian Albrects Universität zu Kiel1991-1992


Member of the Norwegian Bar Association's committee on intellectual property law2012-2015
Chair of the Norwegian Industry's Committee on Competition2012 -
Member of the Norwegian Bar Association's Committee on Ethics2016 -2019
Government Grants for Artists, deputy member of the Committee2018 -


  • «International Licensing and Technology Transfer:  Practice and the Law» Klüwer Law International, co-author
  • «International Design Protection, A Global Handbook», Globe Law and Business, co-author
  • «International Advertising Law, A Global Handbook», Globe Law and Business, co-author
  • Tidsskriftet NIR Nordiskt Immateriellt Rättsskydd, former editor for Norwegian contributions


The Norwegian Bar Association

The Norwegian Association for the Protection of Industrial Property

Association Internationale pour la Protection de la Propriètè Intellectuelle – AIPPI

European Patent Lawyers Association (EPLAW)


The Scandinavian languages, English.