Lone Prehn

Senior Partner at Zacco
Ranked in Denmark
WTR Research

The WTR 1000 focuses exclusively on trademark practice and has firmly established itself as the definitive 'go-to' resource for those seeking world-class legal trademark expertise

Gold - Individuals: prosecution and strategy

Wall-to-wall brand protection is the end goal of Zacco – and with 500-plus staff operating out of 30 offices, it has the wherewithal to achieve it. The IP giant never rests on its laurels, but continually innovates and adapts its offering to the needs of patrons; most recently, it added cybersecurity, software, tech law and data protection legal service lines to its already robust trademark offering. Heading up the Denmark and South Sweden operations, Thomas Mølsgaard nimbly traverses the contentious/non-contentious divide. The owner of some 7,000 active marks, Arla Foods relies on him for effective filing strategies, prosecution and enforcement; while Chanel has appointed him as the main agent for its matters in the Nordics. Versatile operator Heidi Rehné enforces the rights of celebrated Danish design company Hoptimist and protects its 3D trademark. In the words of one satisfied client: “Heidi is pragmatic in her approach and proactively safeguards our interests.” Fabio Pezzolato, Lone Prehn and Knud Wallberg have recently been devising effective strategies and handling prosecution and enforcement matters on a global scale for Lego Systems. Pezzolato is hailed for his willingness to go the extra mile; while Prehn is “a joy to work with. She is bright, reliable and extremely thorough, which means that her advice is just brilliant. Lone is one of the leaders in Denmark for prosecution work”. Also the recipient of warm praise, “Knud is super-knowledgeable and always finds the perfect solution for his clients”.

Lone Prehn's Profile

Lone Prehn has worked at Zacco since 1990. Her practice focuses on trademark clearance and filing strategies, trademark strategies, trademark conflicts (including court cases), EU trademark opposition and cancellation actions, and domain name conflicts.

Ms Prehn is a World Intellectual Property Organisation panellist and has been an alternate judge with the Danish Domain Name Dispute Resolution Centre and a ‘.eu’ panellist. Ms Prehn holds an LLM (1989) from the University of Copenhagen and is an attorney at law. She is also a qualified patent agent registered with the Association of Danish Intellectual Property Attorneys (ADIPA).

Ms Prehn’s memberships include ECTA, MARQUES and the International Federation of Intellectual Property Attorneys. She is a professional representative before the EU Intellectual Property Office.

Ms Prehn was vice president of ADIPA from 2009 to 2010 and is part of its Trademark Committee. In 2010 she was appointed a member of the advisory board of the Centre for Innovation and Information Rights under the Law Faculty of the University of Copenhagen.

Ms Prehn won the ILO Client Choice Award (Intellectual Property – Denmark) in 2010 and 2011, and received a Global Law Experts Award (Intellectual Property – Denmark) in 2013. She is featured in World Trademark Review’s list of the world’s leading trademark professionals and has been awarded the title IP Star by Managing Intellectual Property since 2016.

She is listed in the WTR 1000 (2017-2018) and among Managing Intellectual Property’s Top 250 Women in IP, 2017 and 2018; Who´s Who Legal named her a Recommended Individual for Trademarks, Denmark  in 2019.

Her clients include LEGO, Nestlé, British American Tobacco, PepsiCo and Pernod Ricard.

Firm Profile

Zacco is a modern, full-service IP firm with a 360-degree approach to intellectual property, covering patent filing, trademark registration and design protection to software development, digital brand protection, cybersecurity and portfolio management.

By combining the traditional IP disciplines with cybersecurity, software development and digital brands, Zacco takes care of its clients’ ideas, innovations, data, identity – and all other intangible assets. We protect them, give our clients ownership and make them theirs to keep – now and in the future.

Zacco is present throughout Scandinavia, Germany, the United Kingdom and India, and has more than 30 local offices. Through an extensive network of preferred partners around the world and internal resources, Zacco represents and assists its clients in almost all jurisdictions.

Zacco has more than 500 employees and has experts in all aspects of intellectual property, including a large number of experienced patent, trademark and design attorneys, as well as attorneys at laws, paralegals, IT specialists and software developers.

Work areas

Due to its size, Zacco has specialists in almost all areas of intellectual property.

Its patent practice serves all industries with filing and prosecution, freedom-to-operate, validity and infringement opinions and has a special focus on European patent practice, including oppositions and appeals before the EPO.

In particular, Zacco has succeeded in setting up a patent litigation support team that is unsurpassed in Scandinavia. The team has supported lawyers throughout Scandinavia and beyond, acting for companies such as Pfizer, Eli Lilly, Monsanto, AstraZeneca, SanofiAventis and GlaxoSmithKline.

Its trademark practice assists all industries with filing and prosecution, availability and infringement opinions and has a special focus on European trademark practice, including oppositions, cancellations and appeals before the EUIPO.

A number of companies, including in the fast-moving consumer goods industry, have outsourced the management of their trademark portfolios to Zacco, which – thanks to a well-established infrastructure and economies of scale – can offer a cost-efficient alternative to an in-sourced solution.

In contrast to most other IP firms in Scandinavia, alongside its patent and trademark services, Zacco also provides the full range of IP legal services. These services are offered by a cooperation of law firms and lawyers working and sharing offices with Zacco throughout Scandinavia and in Germany.

The legal practice serves all industries with legal advice and assistance in connection with the drafting and negotiation of contracts relating to intellectual property, technology, advertising and e-commerce, litigation, domain name conflict resolution, establishment of customs surveillance and other measures for the prevention or combat of counterfeiting.

Zacco’s lawyers have successfully represented international clients in proceedings before national courts and the European Court of Justice.

Zacco is constantly evolving and adjusting to its surroundings. With a recent broadening of its scope of services, Zacco is focused on meeting the implications and possibilities of digitalisation. This broadening involves applying a 360-degree perspective on intellectual property, including cybersecurity and software. These additional areas include a number of specific services with the overall purpose of guarding all intangible assets of Zacco’s clients.

Due to its size and the number of employees, Zacco provides tailor-made client teams in almost all industries and across geographical boundaries.


We have a long history as an international IP firm dating back to 1870. After a merger in 2001 – between Hofman-Bang in Denmark, Stockholm Patentbyrå in Sweden and Bryns Patentkontor in Norway – the company adopted the name Zacco after one of its founders, Knut Yngve Zacco.

In July 2009 Zacco merged with the longstanding and well-known IP consultancy Albihns, forming the company Albihns.Zacco. In September 2012 the name was changed to Zacco. In 2016 the Gothenburg-based company Cegumark merged with Zacco. This long-term growth strategy has resulted in one of Europe’s largest and most experienced IP firms.

Value proposition

Our vision is to secure and protect our clients’ entire innovation process and intangible assets. With our technical and legal expertise and experience, we want to guard our clients’ innovations and make them reach their full potential and development.

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