casalonga logo

Our services

Protecting & enforcing
your rights

Over 120 Attorneys-at-law,
Patent and Trademark Attorneys
and staff, all at your service
for protecting your IP rights
in any technical field since 1867.

Contact us

Our offices


Interactive UPC code

Use our Smart and Interactive Code


Unitary Patent App

Consult our fees comparator


Stay informed

1 November 2023

No 10-days rule any more at the EPO as of November 1, 2023

For applicants, the end of the 10-day rule will slightly shorten the term for responding to EPO communication since the deadline is now calculated from the date of the communication. It also (...) 
Learn more
12 October 2023

G1/22-G2/22 - Priority Right: decision of the Enlarged Board of Appeal of the EPO

Decision G1/22-G2/22 of the Enlarged Board of Appeal of the EPO regarding the priority right is out!! In its decision, the Enlarged Board of Appeal of the European Patent Office (EPO) held that: (...) 
Learn more
11 January 2024

Two new partners in emerging technologies at CASALONGA

CASALONGA strengthens its Patent teams with the arrival of two new partners, Augustin Le Tourneau and Ghislain de Trémiolles, French and European Patent Attorneys. With over 20 years experience (...) 
Learn more
27 March 2024

March 2024 - LEGAL 500

Once again this year, CASALONGA is ranked among the leading IP firms in France in The Legal 500 EMEA 2024: - "TIER 1 FIRM" in "Patents – France"- "TIER 1 FIRM" in "Patent and Trade Mark Attorneys (...) 
Learn more
7 March 2024

March 2024 - JUVE PATENT - FRANCE 2024

CASALONGA is once again ranked by JUVE Patent among the top French patent law firms, both in patent litigation (“Litigation Lawyers”) and prosecution (“Patent filing”). «This French IP boutique is (...) 
Learn more



The Unitary Patent

Our team

Find an expert