Peter van Essen M.Sc

European and Dutch patent attorney

This is My Story

Peter (Augustinus) van Essen M.Sc.


I studied physics at Utrecht University, resulting in a masters degree in 1991. My main topics included solid state physics and research at the Dutch Institute for Space Research SRON, where I tested and simulated CCD detectors for soft X-ray detection and spectroscopy. After obtaining my masters degree, I worked at Akzo Nobel Coatings for the Technology Centre Colorimetry for several years. I was project manager for several research projects relating to the measurement and visual assessment of colors.

Expertise as patent attorney

On 1 January 1995, after several years of research at the colorimetry department of Akzo Nobel, I started at the patent department of Akzo Nobel. I drafted and prosecuted patent applications in the field of coatings in many countries all over the world, performed patent clearance searches in the field of amorphous silicon photovoltaic cells, optical switches, and writable Compact Disks.
In 1999, I made a career switch and joined patent firm Vriesendorp & Gaade where I drafted and prosecuted patent applications for small and large companies and also collaborated in several court cases (HA ZA 05-583) and filed several notices of opposition. I also conducted cases for the Boards of Appeal of the European Patent Office, resulting amongst others in decision T 0446/97.
In 2006, I made a subsequent career switch and joined NLO in the Netherlands. There I became the leading patent attorney in several successful court cases (Clyde Bergemann GmbH v. Magaldi, Court of Appeal The Hague, 13 July 2010, Case No. 200.023.759/01, and KG ZA 09-102). I also conducted opposition proceedings, resulting in withdrawal of the opposition against the client’s patent or lapse of the opposed patent.
In my career as a patent attorney, I drafted over 400 patent applications so far, and handled patent cases in many different fields. For instance, electron beam lithography, tyre building apparatus, injection moulded bottle crates, software, packaging, incubators for eggs, building materials, and photovoltaic solar cells.
In 2011, I took up the challenge and started a new patent firm together with co-owner Ard Ellens. It was a fruitful and inspiring collaboration for over five years.
And now, at the start of 2016, I prefer to provide more tailor-made services and a more personal approach, not limited by conventional patent firm approaches, We want to be involved and help your enterprise to get a grip on innovation processes while at the same time avoiding conflicts with third parties rights. I prefer to visit my clients to get acquainted with their company.


I enjoy working on many different subjects and a combination of working for large companies as well as for small- and middle entities (SME’s) and research institutes. It still really challenges me to find a patent strategy together with clients. Innovation is my passion.

Publications and Memberships

I am (co)author of a number of papers in Managing Intellectual Property, concentrating on the topic of patent strategy. I am a member of the Dutch Physical Society (NNV), the Dutch Patent Attorney Association, and the Institute of Professional Representatives before the European Patent Office (EPI) and of the Fédération Internationale de Conseils en Propriété Industrielle (FICPI).

Years of experience

Patents filed.... and still going