Patent Cost in France: How Much Does It Cost to File a Patent?

Protecting an innovation with a patent is a strategic issue for many inventors, companies and start-ups. One key question often comes up: how much does it cost to file a patent in France? Between administrative fees, professional fees and the essential steps of filing, you need to analyse each item of expenditure as well as the procedure to follow. Hashtag Avocats assists its clients through this demanding process, with the aim of ensuring robust protection of the innovation.

What are the administrative costs of filing a patent in France?

Filing a patent involves several unavoidable expenses, mainly in the form of official fees charged by the competent authority. In France, the central body is the INPI, which applies regulated fees. Understanding these items from the outset helps you plan your intellectual property budget properly and avoid unpleasant surprises.

Inventors and funders look at the cost of filing a patent from the preparatory phase. These costs are split between mandatory fixed fees and variable charges depending on the complexity of the innovation or the options selected during the filing process.

Which official INPI fees should you budget for?

The INPI (French National Institute of Industrial Property) collects the main amounts when the patent application is filed. The main fees to consider include:

• Patent filing fee (€26, payable on filing or within the following month)
• Search report fee (state of the art, €520)
• Patent grant fee (€90)
• Annual renewal fee (annuity: the first is included in the filing fee; €38 from the second to the fifth year, then a progressive amount rising to €800 for the twentieth)

Each administrative step gives rise to a separate payment to the INPI. Certain specific situations, such as an international extension via the PCT route or the European route (EPO), also involve additional specific fees, independent of the national scheme.

How are additional fees and paid options calculated?

Optional services can generate additional costs: payment for additional claims (€42 per claim beyond the tenth), correction of formal errors or later amendments. You should therefore check at each step whether an additional fee applies, so as to control the overall cost of the patent.

A summary table of the main expenses helps you assess the total cost of a patent filed with the INPI, taking into account the number of additional claims or specific operations required by the case.

Should you include the fees of a lawyer or patent attorney?

Professional assistance contributes to better protection of the innovation, in particular through the quality of the drafting of the application. Drafting the technical claims rigorously, checking the patentability criteria, responding to the examiner’s observations: all these steps call for in-depth expertise. If you want quality assistance to make each step legally sound, suitable solutions exist, such as intellectual property advice.

In addition to the official fees, using a patent attorney (conseil en propriété industrielle) involves fees that can be substantial. They vary according to the nature of the invention, the protection strategy envisaged – France only or extension abroad – and the level of assistance required.

Which fee items should you plan for when filing a patent?

Patent attorney fees generally include:

• Preliminary study (patentability, analysis of the state of the art)
• Technical drafting of the application, wording of the claims, the cost of which depends on how technical the invention is
• Administrative follow-up, exchanges with the INPI, preparation of the response to the search report, the volume of which varies from case to case

A lawyer also provides useful legal insight, in particular in potential disputes, when analysing compliance with the patentability criteria or in negotiations for an assignment or a licence. All these amounts therefore come on top of the official fees and charges imposed by the INPI or the European or international bodies concerned.

How can you optimise the overall cost without compromising on quality?

Comparing several providers, clarifying the scope of the engagement in advance and identifying precisely the fixed and variable fees give you a clearer picture of the total cost of a patent in France. Some firms even offer transparent fee packages covering all or part of the filing process and related procedures.

To avoid costly mistakes (such as imprecise or incomplete drafting), getting assistance from the outset can limit indirect costs over the life of the patent and strengthen the real protection of the innovative asset.

What are the steps and time limits for filing a patent in France?

Obtaining a patent is not immediate: the procedure follows a series of steps governed by set time limits. Each involves specific actions and specific payments, which makes good organisation essential.

You must follow the sequence of administrative steps, failing which you may lose your rights in the innovation. This requires anticipation, rigour and regular monitoring of every stage of the process.

What are the main phases of the application?

The French procedure typically runs as follows:

1. Official filing with the INPI (payment of the initial fee and submission of the file)
2. Preliminary formal examination
3. Search report drawn up by the INPI (analysis of prior art, payment of the corresponding fee)
4. Publication of the application (18 months after the filing or priority date, Article L. 612-21 of the French Intellectual Property Code (Code de la propriété intellectuelle) (in French))
5. Grant of the patent, the final act confirming ownership of the innovation (subject to payment of the grant fee and compliance of the file)

According to the INPI, the median time to grant is around 30 months. Where there are objections or irregularities, further delays may arise before the title is actually obtained.

How does annual maintenance work and what financial obligations remain?

The patent must be maintained from the application onwards, even before grant: its holder pays the renewal fee every year. The amount increases progressively up to the twentieth year of protection. Failure to pay, after a six-month grace period subject to a surcharge, results in the lapse of the rights attached to the patent (Article L. 613-22 of the Intellectual Property Code (in French)), subject to a request for restoration.

To plan your investment calmly, it is advisable to enter all these deadlines in a dedicated calendar, which minimises the risk of error or oversight that could lead to the loss of the protection of the innovation.

How much does a French patent cost if extended internationally?

The territorial protection offered by a French patent stops at the national borders. To protect the same invention abroad, you need to use other internationally recognised systems such as the European system or the PCT procedure.

These extensions generate significant additional costs compared with a simple local registration. Your thinking on the territorial scope of the right must therefore take into account your financing capacity and the commercial reach targeted for the innovation.

What steps and fees apply for European or international protection?

Here is an overview of the alternatives to the national patent:

• European patent via the EPO (European Patent Office): filing, examination and designation fees (overall amount varies with the number of States targeted and the translations)
• International PCT procedure: a single international application, followed by entry into the national phases, where each State charges for its own formalities

These amounts are frequently increased by the fees of local advisers, who are essential to validate the file and defend it against any oppositions. The overall cost of a foreign patent therefore calls for a rigorous assessment with a professional experienced in international practice.

How should you plan the management and development of your patent portfolio?

An asset protected by several national or regional titles requires closer monitoring: a summary table of deadlines, a map of the strategic markets to prioritise, and identification of the key countries to limit the initial investment without neglecting areas of competitive risk. Digital tools make this administrative side easier, but supervising them remains crucial to avoid any involuntary abandonment.

Over time, focusing your protection efforts on the geographical areas that are actually profitable will let you adjust the budget devoted to industrial property and optimise the overall return on the patent portfolio.

FAQ on the cost and procedure of filing a patent