When does prior private use give a party the right to continue using the invention? Any person may claim personal possession on the ground of Article L. 613-7 of the French Intellectual Property Code providing that said person proves possession of the invention prior to the filing date or priority date of the patent. In…

The French Supreme Court condemned a patentee’s undue use of an evidentiary measure (infringement seizure, “saisie-contrefaçon”) as a way to obtain information from a competitor, specifically information relating to the manufacturing processes of its direct competitor, beyond the scope of the lawsuit (“fishing expedition”). The full summary of this case has been posted on Kluwer…

The Paris Court of Appeal clarified the interest of a potential competitor to seek the revocation of a patent. It was particularly unclear whether any competitor, current or potential, could have a legitimate interest in the form of a “clear the path” approach. However, in this case the Court held that Omnipharm had no legitimate…

The French Supreme Court specified the rules for the application of the doctrine of equivalence in the assessment of infringement of a process patent, holding that a patented process is considered to be infringed under the doctrine of equivalence when both means have the same function in order to obtain the same result as the…

Regarding the gathering of evidence in French and foreign territories, the Paris Court of Appeal affirmed the appealed decision and acceded to defendant’s reasoning in ruling that (i) the ‘saisie-contrefaçon’ carried out on French territory on the basis of two patents was not deprived of its valid basis by the revocation of one of said…

The French Supreme Court for the first time recognized, as a general principle of French patent law, the estoppel “according to which a person may not contradict themselves to the detriment of another person” in the course of infringement proceedings. Click here for the full text of this case. A summary of this case will…