Samen met zijn cliënten bepaalt Leo een IE-strategie en waar nodig dient hij octrooiaanvragen in, behandelt hij deze en verdedigt hij de IE-rechten van zijn cliënten wereldwijd. Onder dit laatste valt ook het betwisten van rechten van derden, licentiëring en FTO-onderzoek. Leo heeft ruime ervaring met octrooizaken bij de rechtbank in Den Haag en bij het Europees Octrooibureau.

Leo is actief betrokken bij de opleiding van nieuwe gemachtigden voor de Nederlandse, Europese en internationale octrooipraktijk. Verder is hij actief lid (voorzitter) van de IP Enforcement and Litigation Group van FICPI, de internationale federatie van IE‑gemachtigden.

In zijn hoedanigheid van European Patent Litigator, is Leo bevoegd om als UPC representative op te treden.

Vanaf april 2026 is hij aan V.O. verbonden als adviseur.

Werkervaring

• Octrooigemachtigde, V.O. (1992-april 2026)
• Freelance consultant Ergonomie en productontwikkeling (1989-1992)
• Ergonomie Afdeling, Volvo Cars (1989)

Opleiding

• Ir, Industrieel Ontwerpen, Technische Universiteit Delft (1989)

Directories

• “Leo Jessen … specialises in consumer products and medical devices and is adept at coordinating multi-jurisdictional strategies to strengthen European patent positions, including handling complex EPO oppositions” (IAM Patent 1000, 2026)
• “… Leo Jessen is a robust defender of his international clients’ IP rights, leveraging his mastery of Dutch and EU IP law to present cases before The Hague and the EPO with great finesse” (IAM Patent 1000, 2025)
  
• “Leo Jessen is the go-to mastermind of cases on consumer products, ergonomics and medical appliances. He has also been entrusted with roles of seniority, acting as chair of the IP enforcement and litigation group of the International Federation of Intellectual Property Attorneys” (IAM Patent 1000, 2024)
• Recommended individual (JUVE Patent 2020 – 2024)
• “Jessen combines his exceptional technical knowledge with a fine-grained understanding of patent law to devise strategies and enhance the commercial potential of patent portfolios” (IAM Patent 1000, 2023)
• “Leo Jessen is the man to call for no-stone-unturned freedom-to-operate analyses and futureproofed protection strategies. A hugely experienced patent attorney, he plays a valuable mentoring role and is respected in the wider market as an excellent educator” (IAM Patent 1000, 2021)
• Recognized as IP Star (2014 – 2026) by Managing Intellectual Property
• Recommended Individual (IAM Patent 1000, 2020 – 2026)
• “Always performs excellently in the courtroom” (JUVE Patent 2020)
• “Gifted in both prosecution and litigation”, Leo Jessen is “extremely good at building a case” (IAM Patent 1000, 2019)
• “Peers praise Leo Jessen as ‘a really excellent, strong attorney who’s been around for many years’. Jessen prosecutes applications for a wide segment of devotees, who depend on his aptitude in filing, oppositions and appeals to keep their stress levels low throughout the patent lifecycle” (IAM Patent 1000, 2018)
• “Heineken is one of the big names that engage Leo Jessen for his drafting and prosecution talents” (IAM Patent 1000, 2017)
• “A key reference for companies in the consumer products sector, Leo Jessen has recently been advising Heineken on the expansion of its patent portfolio” (IAM Patent 1000, 2016)
• “Leo Jessen is one of a rare breed, having spent his entire career at a single firm. With V.O. since 1992, the quick-witted strategist advises mechanical engineering clients on how to procure, defend and monetise IP rights” (IAM Patent 1000, 2015)
• “Leo Jessen can address the myriad of concerns which arise in the mechanical engineering space” (IAM Patent 1000, 2014)
• “‘Excellent communicator’ Leo Jessen and Bernard Ledeboer are the top mechanical engineering specialists there” (IAM Patent 1000, 2013)
• “Leo Jessen is renowned for his creative approach, especially in relation to mechanical patents. Mechanical engineering is his field and he has profound knowledge of consumer products, ergonomics and medical appliances” (IAM Patent 1000, 2012)

Nevenactiviteiten

• FICPI: Secretaris van de Nederlandse sectie en lid van CET Group 7, IP Enforcement and Alternate Dispute Resolution
• AIPPI
• AIPLA

Talen

• Nederlands
• Engels
• Duits
• Frans