Why do we talk about a “provisional patent”?
In France, since 1 July 2020, it has been possible to file a “provisional patent application” (DP) with the INPI. It allows you to quickly obtain an official date with a simple technical description, sans claims ni abrégé dans un premier temps, puis de décider dans les 12 mois de mettre le dossier “en conformité” (c’est-à-dire le transformer en demande classique) ou de le convertir en certificat d’utilité. À défaut d’action dans ce délai, la DP est réputée retirée et n’est pas publiée. Attention toutefois: aucun ajout d’informations techniques n’est permis lors de la mise en conformité.
In the United States, the “provisional patent application” (PPA), introduced by 35 U.S.C. §111(b), works in a similar way: no substantive examination, no requirement for claims, 12 months to file a non-provisional application that claims the benefit of the PPA's date (with, in certain cases, possible restoration up to 14 months via an “unintentional delay” petition). The PPA does not apply to designs and permits the use of the “Patent Pending” notice. Converting a PPA to a non-provisional by petition is possible but shortens the patent term. Conversely, filing a non-provisional claiming the benefit of the PPA does not reduce the term, which remains 20 years from the non-provisional filing date (35 U.S.C. §154).
The true assets of the provisional
- To book an appointment quickly and cheaply to freeze a state of the art and display “demande de brevet déposée” (FR) or “Patent Pending” (US) when discussing with partners and investors. In France, the patent application can be converted into a utility certificate (10-year title) if the strategy evolves. Above all, the 12-month priority effect provided for by the Paris Convention allows for extension abroad while retaining the initial date.
- Win a year to refine the strategy (claims, proofs of concept, freedom to operate) before supporting the cost of search and examination (FR) or prosecution (US), while remaining unpublished if abandoned (FR).
Blind spots (and real-world case studies) that hurt
- Insufficient support = lost priority. If the provisional description does not faithfully “carry” what you will later claim, you risk losing the benefit of the provisional date. US case law illustrates this starkly: in New Railhead v. Vermeer, priority claimed to a provisional application was denied because the claimed detail was not described. Prior sales (>1 year) then destroyed the patent. In Dynamic Drinkware v. National Graphics, the Court reiterated that the effectiveness of a provisional application as prior art depends on written support complying with §112 for the claims of the subsequent patent.
- Europe is stricter on the “same invention”. At the EPO, priority is only recognised if the claimed subject matter is directly and unambiguously derivable from the priority document (G 2/98). A summary provisional can therefore cause you to lose priority in Europe if you have broadened, specified or rephrased without sufficient basis. Even if the practice of “partial priorities” (G 1/15) has clarified certain situations, the disclosure requirement remains high.
- Powerful… but not a universal shield. Public disclosure before filing remains dangerous internationally: the United States tolerates a 12-month grace period for inventor disclosures, but Europe only recognises a 6-month safety net in limited cases (obvious abuse, official exhibitions). Do not count on a provisional patent to “catch up” after a public presentation if you are targeting countries with no real grace period.
- The “first filing trap”. The DP/PPA triggers the 12-month priority period (Paris Convention). Re-filing a new provisional application one year later to “start from scratch” is only possible under strict conditions: the first application must have been withdrawn/abandoned/refused, unpublished, and “without remaining rights”, before the subsequent one is filed. Otherwise, the second application cannot serve as a “first filing” and you risk losing rights abroad. European and British patent offices insist on this requirement of Article 4 C(4).
Best practices for limiting risk
- Write the provisional description “as if real”: modes de réalisation, variantes, exemples, paramètres, alternatives, limites, figures utiles. Aux États‑Unis comme en Europe, la valeur du provisoire se joue sur la suffisance de description et l’appui des futures revendications. Évitez les lacunes que vous ne pourrez pas combler à la mise en conformité (INPI: aucun ajout d’info technique n’est permis) ou lors du dépôt non‑provisoire (US).
- Prioritise your tasks and schedule.. To set the 12-month deadline for extensions (Paris/PCT) from the outset and, if necessary, the “regeneration” of a priority in compliance with Paris IV(4) conditions. Formalise withdrawals “without remaining rights” before any new filing that serves as a basis.
- Do not disclose out of strategy. Even with a PPA/DP, avoid unnecessary public disclosures if Europe is targeted. The 6-month exception (abuse/exposure) is narrow.
- On the US patent application, it is generally preferable to file a non-provisional application claiming the benefit of the PPA. rather than converting the GIC to preserve your 20-year term, don't forget the 14-month grace period in case of oversight, via petition and fee.
What is the real purpose of provisional arrangements in an international strategy?
The device is an excellent “option tool”. It sets a date, opens the 12-month worldwide priority (Paris), allows for the valorisation of an innovation during sensitive discussions, and provides time to choose between a patent, a utility certificate (FR), or a clean abandonment. However, its power relies on the quality of the initial disclosure and procedural discipline over 12 months. If poorly drafted, a provisional patent can prove worse than useless: it creates an illusion of security and leads to a loss of priority, as rights holders have experienced in US case law. If poorly synchronised, it can derail a strategy for extensions in Europe by failing to satisfy Article 4 C(4).
L’essentiel pour décider
Le brevet provisoire est un atout lorsqu’il est traité comme un vrai dossier technique (complet et tourné vers les revendications à venir) et piloté avec un calendrier international rigoureux. Il devient un risque lorsqu’on le réduit à une “affichette” marketing ou à un simple ticket d’attente. Si votre horizon inclut l’Europe, redoublez d’exigence sur la description, limitez les divulgations avant dépôt et anticipez les règles de priorité et de “première demande”. Dans ce cadre, DP et PPA restent des leviers puissants pour gagner du temps sans perdre de droits.