Contact information

Kristoffer Weltzien
Attorney at law / Partner

Phone: (+47) 24 00 37 54


Kristoffer Weltzien has more than 15 years’ experience working as an IP attorney specialising in the chemical and pharmaceutical sectors. He also has handled counterfeit cases for several, well-known international consumer brands. In addition, Weltzien’s eight years’ experience as an examiner with NIPO (Norwegian Patent Office) has proved invaluable to his international clients when advising on prosecution and handling og trademark and design applications in Norway.

A seasoned strategist in IP rights establishment and enforcement, Weltzien practices an ‘in-house’ approach to his client relationships, working in close collaboration with the client to ensure tailor-made advice. He is also a key player in Onsagers’ cooperation with the Confederation of Norwegian Enterprise, and is frequently used as a speaker at its events.

Key Experience

Kristoffer is best known for his work with Yara International, TINE, Arcus and Photocure. He has successfully litigated counterfeit cases for many international clients including L’Oreal and Diadora, and has represented Ringnes (Carlsberg) in trademark infringement cases.

Articles, Publications, Speeches

Guest lecturer on patents, trademarks and IP protection at NHO Conference, Oslo, Aug 2015. NHO is Norway’s major employers’ organisation and the country’s leading business lobby.

Weltzien has given several in-house talks to clients on a variety of trademark issues.

Career History

2009 – Date: Onsagers, Attorney at law, Senior Partner

2008 – 09: Tandbergs Patentkontor, Associate Attorney, Head of Legal

2000 – 08: Norwegian Industrial Property Office (NIPO), Legal Advisor

1998 – 00 Norwegian Ministry of the Environment, Senior Consultant


University of Oslo, Law degree (Master of Law))