1867: Dominique-Antoine CASALONGA, with an engineering degree from Arts et Métiers and a great interest in thermodynamics, having invented a number of mechanical devices, in particular in connection with measuring the rate of flow of liquids, became interested in how to obtain patent protection for inventions. He founded the firm both to help investors construct prototypes but also to assist them with obtaining patent protection for their inventions.
1884: Dominique-Antoine CASALONGA participates in the creation of the first French association of patent attorneys (Syndicat des Ingénieurs et Conseils en Propriété Industrielle). He is one of the founding members.
1903: Doumé CASALONGA, second son of Dominique-Antoine CASALONGA, with a law degree takes over the management of the firm.
1934: Doumé CASALONGA is elected chairman of the French association of patent attorneys (Compagnie des Ingénieurs Conseils en Propriété Industrielle).
1940: Doumé CASALONGA becomes an Expert in industrial property before the Paris Court of Appeal.
1941: Alain CASALONGA, son of Doumé CASALONGA, with an engineering degree from Ecole Centrale de Paris and a Doctorate in law, takes over the management of the firm and develops its activity soon after the end of the second world war by visiting new clients in Europe and in USA thus developing important relationships with a large number of multinational companies, which remain clients of the firm today.
1969: Axel CASALONGA, son of Alain CASALONGA, with an engineering degree from the Swiss Institute of Technology (ETH-Zurich) and a Doctorate in industrial property law, becomes partner.
1976: the Munich Office is opened for representation before the European Patent Office.
1976: a suboffice is opened in Grenoble to assist the local industry and research laboratories.
1981: the CASALONGA firm takes over the activities of JOSSE & PETIT, a well-known industrial property firm in Paris. The name of the firm is changed to Bureau D.A. CASALONGA-JOSSE.
1988: Gérard DOSSMANN with a Masters in chemistry and physics from the University of Strasbourg and a Masters in law becomes partner.
1996: the Alicante Office is opened for representation before the OHIM in Community Trademark matters and latter on Community Design matters.
2003: Francis ZAPALOWICZ with an engineering degree from Ecole Centrale of Lyon becomes partner.
2005: Creation of the law firm CASALONGA AVOCATS by Caroline CASALONGA, Attorney at Law, eldest daughter of Axel CASALONGA.
2006: Olivier DELPRAT with an engineering degree in electronics and automatics from the Paris University, becomes partner.
2006: Arnaud CASALONGA, son of Alain CASALONGA, Attorney at law and his team of IP lawyers join CASALONGA AVOCATS.
2007: Karina Dimidjian-Lecomte, with a JD from Georgetown University Law Center, member of the Paris and New York Bars becomes partner.
2009: Jürgen NEUGEBAUER, Patentanwalt, becomes partner of the Munich Office.
2010: the Munich Office of CASALONGA-JOSSE, becomes "CASALONGA & PARTNERS".
2010: Virginie MARTIN-CHARBONNEAU, with an engineering degree from Ecole Nationale Supérieure de Chimie de Paris and Marianne GABRIEL, Attorney at Law, become partners.
2012: Bureau D.A. CASALONGA-JOSSE becomes CASALONGA & ASSOCIÉS.
2012: Baptiste LECOEUR, with an engineering degree from Ecole Nationale Supérieure de Chimie de Paris, Master at Law, become partner.
2014: A suboffice is opened in Toulouse by Matthieu SAGNES (electronics) and Patricia LEDRUT (mechanics), to assist the local industry and research laboratories.
2015: Cristina BERCIAL-CHAUMIER, Attorney at Law, becomes partner of Alicante Office. Gwennhaël LE ROY, with an engineering degree from Ecole Européenne de Chimie, Polymères et Matériaux and Julien THON, with an engineeing degree from École Nationale Supérieure des Arts et Industries, become partners.
2017: A suboffice is opened in Lyon by Marcel-Xavier PEIGNE.
2017 : Floriane CODEVELLE, Attorney at Law, becomes a partner.
January 1st, 2018: CASALONGA becomes the 1st French law firm of lawyers and patent and trademark attorneys. Casalonga & Associés and Casalonga Avocats merge to became CASALONGA.
2018 : A suboffice is opened in Montpellier by Laurence SCHARDT, Trademark Attorney.
2019 : A suboffice is opened in Beaune by Josephine ROUX, Attorney at Law.
2019 : The Toulouse suboffice is expanding with the arrival of Pascaline VINCENT, Attorney at Law, who joins Matthieu SAGNES, Patent Attorney.
2019 : Casalonga leaves its historic offices on Avenue Percier to move to the in the 6th arrondissement of Paris, rue de Fleurus.
2020 : The Lyon suboffice is expanding with the arrival of Marie VIDAL, Patent Attorney (chemistry) and Robin MANGIN (electronics).