Trademark Invalidation Lawsuits: Challenging a Registered Mark in Turkey

A trademark does not become untouchable once it is registered before TÜRKPATENT. When a mark that should never have been granted has entered the register, the way to nullify it is no longer an administrative objection but an invalidation lawsuit brought before the courts. Whereas the publication opposition and Re-examination Board (YİDK) process operates administratively before registration, an invalidation action is a judicial remedy that arises after the mark is registered, and it is filed before the specialised intellectual and industrial property court. Turkish IP Law No. 6769 sets out in detail the grounds for this action, who may bring it, and the effects of the resulting decision.

Grounds for Invalidation: What Article 25 Rests On

Article 25(1) is explicit: if one of the situations listed in Articles 5 or 6 exists, the court shall rule the mark invalid. In other words, an invalidation action is founded on the very refusal grounds that should have blocked registration in the first place.

Absolute refusal grounds (Article 5) concern public interest: lack of distinctiveness, descriptive signs, generic terms, deceptive marks, and signs containing religious values. Relative refusal grounds (Article 6) protect prior right holders: likelihood of confusion with an earlier mark (6/1), protection of well-known marks, unauthorised registration by a commercial agent, priority over an unregistered sign used in trade, and bad-faith registration (6/9). Bad faith is one of the grounds foreign brand owners rely on most often; it is a powerful basis against a party who registers another's mark knowingly and to secure an unfair advantage.

There is an important exception: under Article 25(4), a mark registered contrary to certain absolute grounds such as lack of distinctiveness cannot be invalidated if it has subsequently acquired distinctive character through use.

Who May Sue, and Against Whom

Article 25(2) grants broad standing: interested parties, public prosecutors, or the relevant public institutions may request invalidation from the court. "Interested parties" covers natural and legal persons whose own application is blocked or whose commercial activity is restricted by the registered mark; the claimant is expected to rely on a prior right or a concrete legal interest.

Under Article 25(3), the action is brought against the persons recorded in the register as the trademark owner on the filing date, or their legal successors. Unlike the YİDK process, the Office is not joined as a party to an invalidation action; the dispute is between the private party whose rights are affected and the right holder. Where the grounds concern only some of the goods or services, the court may order partial invalidation (Article 25/5).

The Non-Use Defence and Acquiescence

The claimant must also watch for defences. Article 25(7) allows the defendant to raise a non-use defence in invalidation actions based on Article 6/1: if the claimant's basis mark has been registered for at least five years as of the filing date, the defendant may demand proof that this mark has been genuinely used for the relevant goods or services. If use cannot be proven, the basis of the action collapses.

The second limit is loss of right through acquiescence. Under Article 25(6), a trademark owner who knew, or should have known, that a later mark was being used and remained silent for five consecutive years may no longer invoke its mark as a ground for invalidation. However, if the later registration was made in bad faith, this five-year period does not run and the action may be filed at any time.

The Retroactive Effect of Invalidation

The most critical feature distinguishing invalidation from revocation is that the decision has retroactive effect. Under Article 27(1), where a mark is ruled invalid the decision is effective from the trademark's filing date, and the protection afforded by the Law is deemed never to have arisen. The mark is treated as if it had never legally existed.

This powerful consequence has exceptions to protect good-faith third parties. Article 27(3) provides that, without prejudice to compensation claims arising from the owner's gross negligence or bad faith, the retroactive effect does not affect: final and enforced court decisions on infringement rendered before the invalidation, and contracts concluded and performed before the decision (for example, licence agreements). Sums paid under such a contract may be reclaimed in whole or in part on equitable grounds (Article 27/4). A final invalidation decision is effective against everyone; the court forwards it to the Office ex officio, and the mark is struck from the register and published in the Bulletin (Article 27/5-7).

Defensive Invalidation for Foreign Brand Owners

Because Turkey follows the "first-to-file" system, an application for an internationally well-known mark may be refused in Turkey because a conflicting mark was previously registered by a third party. Here, an invalidation action becomes a defensive strategy: by nullifying the blocking registration in court, you clear the path for your own application.

The competent court, under Article 156, is the intellectual and industrial property civil court. Because this action is brought directly against the registered right holder rather than against an Office decision, venue for actions against third parties lies with the court of the claimant's domicile or the place where the unlawful act occurred; unlike YİDK annulment actions, it need not be filed in Ankara. In practice, acting early, building a strong file of priority and bad-faith evidence, and watching the five-year acquiescence period are decisive.

Frequently Asked Questions

What is the difference between an invalidation lawsuit and a YİDK objection? A YİDK objection is an administrative route before TÜRKPATENT while the mark is still unregistered. An invalidation lawsuit is a judicial action filed before the intellectual and industrial property court after the mark is registered, and its decision is retroactive.

Is there a deadline for filing an invalidation action? Law No. 6769 does not set a general limitation period; however, under the acquiescence rule, staying silent for five years while knowing the later mark is in use forfeits the right to sue. This limit does not apply to bad-faith registrations.

Does an invalidation decision remove the mark entirely? If the ground concerns only some goods or services, the court may order partial invalidation, in which case the mark is cancelled from the register only for the relevant classes.

What happens to a licence agreement made earlier with an invalidated mark? Under Article 27(3), contracts concluded and performed before the decision are protected from retroactive effect; however, sums paid may be reclaimed in whole or in part on equitable grounds.

How Mona Hukuk Can Help

Trademark invalidation actions are a specialised field resting on the correct identification of refusal grounds, a strong evidentiary file, and strict procedural rules. At Mona Hukuk we advise domestic and foreign brand owners on assessing invalidation grounds, compiling bad-faith and priority evidence, preparing proof-of-use files against the non-use defence, and providing legal support in invalidation actions before the intellectual and industrial property court.

For consultancy in Antalya, you can write to contact@monahukuk.com or call +90 (242) 606 14 32.