Glossary
French: forclusion par tolérance
Forclusion par tolérance — roughly “for-close-oo-see-OHN par toll-eh-RAHNSS” — is a procedural rule that bars third-party actions against a trademark that has been registered and used by its owner for more than five years, where the third party knew of the registration and its use. A prior-right holder who has knowingly tolerated the later mark for five years can no longer sue to attack that registration or its use.
The five-year period begins when the prior-right holder had actual knowledge of both the registration of the later mark and its use — mere publication in the BOPI is often treated as sufficient to trigger knowledge for a professional operating in the same field, since publication is precisely what the bulletin exists to do. Awareness, not confusion or damage, is the trigger; the rule does not require that the earlier owner have suffered any actual harm during those five years, only that it stood by while the later mark was used. This is why systematic monitoring matters more under French and EU practice than a US trademark owner might expect: five years is not a long runway, and once it expires, the substantive strength of the prior right becomes irrelevant to a challenge based on it.
The closest US doctrines are laches and acquiescence — but with a decisive difference: those are equitable, fact-sensitive defenses assessed case by case, weighing prejudice and delay, while forclusion par tolérance is a statutory, bright-line five-year rule laid down by the Intellectual Property Code. A US court can excuse a shorter delay, or decline to apply laches despite a longer one, depending on the equities of the case; a French or EU tribunal applying the tolerance bar has no such discretion once the five years and the knowledge requirement are established. In its practical effect — immunizing a mark that has coexisted openly for five years — it also loosely resembles the way US incontestability cuts off certain challenges, such as mere descriptiveness, after five years of continuous use, though the mechanisms, grounds and consequences remain entirely distinct: incontestability is something a trademark owner affirmatively earns by filing, while forclusion par tolérance is something a challenger loses through inaction.
The bar protects the later mark against all types of prior rights: earlier trademarks, company names (dénominations sociales), trade names, shop signs (enseignes), domain names and copyrights. It does not, however, cure the later mark’s own validity defects — a mark that lacks distinctive character or was filed in bad faith is not rescued by five years of toleration by a third party, because those are different grounds directed at the mark itself rather than at a competing right.
For US brand owners with French or EU exposure, the rule turns monitoring into a hard obligation: sitting on knowledge of a conflicting registered and used mark for five years extinguishes the right to act, regardless of how strong the earlier mark is or how confusing the later one has become in the meantime. A proactive watch service exists precisely to catch conflicting filings within the opposition window — long before tolerance starts running, and at a fraction of the cost of the infringement action that acquiescence would later foreclose.
This issue surfaces whenever a US company discovers, years after the fact, that a competitor has been openly using a conflicting mark in France or the EU — the first question counsel will ask is how long the company knew and did nothing. It bears directly on trademark watch strategy, on any trademark cancellation or trademark litigation analysis, and on the broader statute of limitations applicable to trademark claims in France.