Patents in France: an overview for foreign businesses

France is one of Europe's most significant patent jurisdictions and, for many foreign businesses, a priority filing destination alongside Germany, the United States and Japan. It hosts a large industrial and research base, an active licensing market and a mature body of patent case law, and Paris is home to a central division of the new Unified Patent Court. The challenge for foreign applicants is rarely that French patent law is unusual on its substance; it is that there are three distinct routes to protecting an invention in France, run by different bodies, and conflating them is a common and expensive mistake. This page frames how those routes fit together at a high level and points to detailed walkthroughs for the mechanics. It is general information rather than legal advice, and the wider context sits in our France jurisdiction overview.

What a patent protects in France

A French patent protects an invention, broadly a technical solution to a technical problem. To be patentable, an invention must generally be novel (new against the state of the art made available to the public before the relevant date), involve an inventive step (it would not have been obvious to a person skilled in the art), and be susceptible of industrial application. Novelty is assessed against the prior art worldwide, and earlier-filed but later-published applications can affect the novelty position without counting towards inventive step, so the precise treatment is a confirm-with-counsel point. Certain subject matter is excluded or treated specially, including discoveries, scientific theories and mathematical methods as such, and the patentability of software-related and computer-implemented inventions is a matter to check with local counsel early. The substantive requirements derive from the French Intellectual Property Code (the Code de la propriete intellectuelle), which closely mirrors the European Patent Convention standards you will recognise from most major systems. Protection is tied to what the claims of the granted patent define, so drafting determines what you actually own. A French patent runs for a defined term measured from the filing date, subject to renewal (annuity) payments to keep it in force; official fees apply, and you should confirm the exact term, any extensions and the annuity schedule with INPI or local counsel rather than treating them as fixed.

Three routes to protection

This is the point to get right. The first route is a national French patent granted by the National Institute of Industrial Property, the Institut National de la Propriete Industrielle (INPI), under domestic law. The second is a European patent, examined and granted centrally by the European Patent Office (EPO) under the European Patent Convention, then validated in France so that it takes effect there. A classically validated (non-unitary) European patent is enforceable in the French national courts; during the transitional period it also falls under the Unified Patent Court's jurisdiction unless the proprietor has opted it out, so confirm the current transitional rules with counsel. The third is the Unitary Patent: after the EPO grants a European patent, the proprietor can request unitary effect, giving a single right that covers France and the other participating member states (not all EU countries, as several states are outside the system) and is enforced through the Unified Patent Court (UPC). Keep the institutions distinct: INPI is a French national office and is not the EPO; the EPO is not an EU body; and the EU's trade mark and design office (the EUIPO) does not grant patents at all. We cover the Unitary Patent and the court that enforces it in our Unitary Patent and UPC overview, and the practical mechanics of a French filing in our guide to filing a patent in France. Which combination fits your commercial map is a genuinely fact-specific judgement.

The PACTE reforms

A point that distinguishes France from how some applicants remember it: the PACTE law (the loi PACTE, enacted around 2019 with measures phasing in across 2019 and 2020) reshaped the French patent system in several ways that matter to foreign filers. Historically INPI did not refuse a national application for lack of inventive step; PACTE introduced substantive examination, so INPI now examines inventive step and can reject an application that fails it, bringing national grants closer in rigour to the European route. PACTE also created a post-grant administrative opposition before INPI, giving third parties a route to challenge a granted French patent without going straight to court, and introduced a provisional patent application as a lighter, lower-commitment way to secure an early filing date that is later completed. The precise scope of examination, the window for filing an opposition, and the period within which a provisional application must be completed are governed by rules that change over time, so treat each as a confirm-the-current-position point with INPI or local counsel rather than a fixed period. France is a first-to-file jurisdiction, so the practical rule holds: file before you disclose, because public disclosure before your filing or priority date can destroy novelty, subject only to narrow exceptions you should confirm with counsel.

The certificat d'utilite alternative

Alongside the standard patent, France offers a national alternative, the utility certificate, or certificat d'utilite (a registered right for inventions that meet the patentability conditions but is sought through a lighter, shorter-term track). PACTE strengthened it, extending its maximum term and allowing conversion of a utility certificate application into a patent application in defined circumstances; confirm the current term and the conversion conditions with INPI. The trade-off is the familiar one: a utility certificate can be a quicker, lower-cost way to obtain protection, particularly for inventions with a shorter commercial life, but its real-world strength and the procedural steps needed to enforce it differ from those of a full patent. We explain the system, and when it is the right call, in our certificat d'utilite guide.

Reaching France internationally

Many foreign applicants reach France through the Patent Cooperation Treaty rather than by filing directly: you file a single international application, then later enter the national or regional phase, where either INPI (national phase) or the EPO (European regional phase) handles it. This defers country-specific costs and translation decisions. National and regional-phase entry deadlines are strict and counted from your priority date, and you will usually rely on a Paris Convention priority claim from your first application to keep that date while filing later in France; treat the specific deadlines and the priority window as confirm-with-counsel details. Our overview of the PCT national and regional phase explains the international stage in general.

This overview is general information about the French patent system and is not legal advice. IPEnvoy is not a law firm and does not provide legal advice. French patent law is detailed and changes, and the routes, reforms, terms and fees described here in general terms should be confirmed against INPI's official website and with a qualified local IP professional before you act. Where it helps, IPEnvoy can route you to vetted local counsel in France who can assess your specific position.