From pharmaceutical compositions, small molecules, catalysts, petrochemicals, agrochemicals, polymers, process engineering, energy, materials, consumer products, household products to anything in the world of foods and beverages, food supplements to animal feed, the attorneys in our chemistry team are specialists with knowledge that covers a variety of chemical technologies, enabling a seamless service in conjunction with the firm’s other teams at the interfaces with engineering and life sciences.  

A combination of PhD degrees at leading universities, academic experience and hands-on experience within industry-leading companies, academic research, and extensive patent expertise, equips our chemistry team patent attorneys with the tools to solve even the most challenging problems. We have a long-standing working relationship with a great number of big players in the chemistry and food sector, as well as with smaller SME’s and research institutes and universities. From bakery products and processes to beer brewing technologies to lipids and oils, you can benefit from our experience in this specialized technology field. Our team is also skilled to help clients specialized in plant-based food alternatives. 

Our patent attorneys and advisers working in this field have extensive experience in the protection of inventions in the field of organic, inorganic, physical and solid state chemistry, metallurgy and materials science, coatings, paints, and process engineering. Our patent attorneys also have considerable experience in filing and prosecuting applications relating to pharmacy, food and feed chemistry, as well as polymer chemistry. 

In the development of inventions either for chemical applications, the issue of scope of the claim is often of major importance for the value of the patent and at the same time an issue of debate within the national patent offices. It is important to draft patent applications which contain the necessary basis to ensure appropriate protection. 

Our high level of expertise in the different specific fields of chemistry ensures that these issues are considered the first moment that the invention is considered in order to properly draft priority documents. 

We have an extensive team of patent attorneys and advisers who have an in-depth experience  

in the field of chemistry. We advise our clients on the acceptable scope of chemical claims and the best strategy for protection within the present legal frameworks. Our patent attorneys and advisers rendering services in this field all have strong scientific backgrounds and are closely involved in monitoring the evolution of the case law in chemistry. 

Our prominence in chemistry and EPO patenting is also reflected by our partner Dr. Andrej Michalik who is a member for Belgium of the EPPC (European Patent Practice) committee of epi. Dr. De Clercq is currently Deputy Secretary and BE council member for epi.  

Our team of (Belgian) Patent Attorneys has extensive experience in protecting and defending the extension of the term of patents via Supplementary Protection Certificates (SPCs) before the national patent offices. Patents pertaining to a particular medical or plant protection product can be extended by a period of not more than five years through Supplementary protection certificates. 

Our chemistry team consists of  some reputed patent attorneys with extensive experience of EPO opposition and appeal procedure work.  The emphasis is on staying at the forefront of legal developments, actively seeking feedback and engaging in debate during team meetings to develop innovative strategies for drafting, prosecution, and litigation. The goal is to maintain a reputation for providing reliable, thoughtful, and relevant advice to clients. 

Furthermore, we place importance on building strong relationships with clients. This is achieved by fostering trust through open communication and consistently delivering actions that align with the clients' needs and expectations. 

Additionally, we take a comprehensive approach to intellectual property (IP) matters. Patent specialists collaborate closely with the trademark and transactions teams to provide clients with a complete IP service, addressing various aspects of intellectual property protection and management. 

Overall, the focus is on delivering high-quality legal services while prioritizing client relationships and staying up to date with the latest developments in the legal field.  

Our team won two times in a row the “Opposition Procedure Firm of the Year” at LMG Life Sciences EMEA Awards in 2022 and 2023. We were awarded Patent Attorney Firm of the Year in Belgium' at the Global IP Awards in 2023, Belgian Prosecution Firm of the Year 2023” at the Managing IP Awards and the ‘Best IP Firms for Patent Prosecution” category Leading by Leaders League in 2023. 

“De Clercq & Partners is a first-rate practice that operates at the very top of European patent prosecution and truly deserves its excellent reputation. Its strong team of attorneys bring a diverse set of technical and legal expertise, and are highly valued for their availability, diligence and commitment.” The firm has many talented prosecutors on board who each come highly recommended by patrons and peers alike: “Caroline Hennin delivers a great service and has strong expertise. She understands the importance of communication and keeps patrons well informed throughout the patenting process.” The “excellent European patent prosecution attorney” Sakina Bounaga has recently teamed up with Vanhalst to represent Cosucra Groupe Warcoing in ongoing opposition proceedings against medical device company Abbott Laboratories.” 

IAM Patent 100 2023

“De Clercq & Partners is one of the leading Belgian firms for patent protection and portfolio management work, particularly in the fields of biotechnology and chemistry. The firm has several experienced European patent attorneys such as Ann De Clercq, Sakina Bounaga, and Liesbet Paemen.”

Managing IP STARS Reviews 2023

Key Contacts


Sakina Bounaga

Sakina Bounaga, PhD

European Patent Litigator, European Patent Attorney, Partner
Read more | Sakina Bounaga
Pieter Gregoir

Pieter Gregoir, DPhil

Belgian Patent Attorney, European Patent Attorney, European Patent Litigator
Read more | Pieter Gregoir
ir. Caroline Hennin

ir. Caroline Hennin, PhD

European Patent Litigator, Belgian Patent Attorney, European Patent Attorney
Read more | ir. Caroline Hennin
ir. Kris Pappaert

ir. Kris Pappaert, PhD

European Patent Litigator, European Patent Attorney
Read more | ir. Kris Pappaert
ir. David Lesthaeghe

ir. David Lesthaeghe, PhD

European Patent Litigator, Belgian Patent Attorney, European Patent Attorney
Read more | ir. David Lesthaeghe
ir. Hans Goesaert

ir. Hans Goesaert, PhD

Belgian Patent Attorney, European Patent Attorney, European Patent Litigator
Read more | ir. Hans Goesaert
Lieve Coenegrachts

Lieve Coenegrachts, PhD

European Patent Attorney, European Patent Litigator
Read more | Lieve Coenegrachts
Verónica Rojas de la Parra

Verónica Rojas de la Parra, PhD

European Patent Attorney, European Patent Litigator
Read more | Verónica Rojas de la Parra
Jacek Kepa

Jacek Kepa, PhD

European Patent Attorney, European Patent Litigator
Read more | Jacek Kepa
Filip Van Lysebetten

Filip Van Lysebetten, PhD

Patent Adviser
Read more | Filip Van Lysebetten