Receiving a trademark registration in Korea does not mean the right is permanently safe. After registration, two core procedures allow third parties to challenge the right: an invalidation trial and a cancellation trial. Both proceed before the Korean Intellectual Property Trial and Appeal Board (IPTAB), but the parties who can file, the grounds, and the effect of the decision differ significantly.
In practice these trials are not theoretical exercises. They remove concrete blockers — a senior registration discovered just before launch, a defensive registration suspected of non-use, or a competitor abusing its mark. Knowing when to file, what evidence to prepare, and the likely cost is the difference between clearing a path and losing the window.
Invalidation vs. Cancellation: What's the Difference?
Both proceedings extinguish a registered trademark, but the type of defect attacked is different. An invalidation trial argues that the registration was flawed from the start (lack of distinctiveness, similarity to a senior mark, etc.). A cancellation trial argues that the registration was valid, but a defect arose later in use or management (most commonly, three years of non-use).
| Item | Invalidation | Cancellation (Non-use) |
|---|---|---|
| Statute | Trademark Act art. 117 | Trademark Act art. 119(1)(iii) |
| Standing | Interested party or examiner | Anyone |
| Typical ground | No distinctiveness, conflict with prior mark | No use in Korea for 3 consecutive years |
| Effect | Void from the beginning (retroactive) | Extinguished from the date the decision becomes final |
| Time bar | 5 years from registration (with exceptions) | Available while non-use continues |
Invalidation Trial: Standing and Grounds
Under Trademark Act article 117, only an interested party or an examiner can file an invalidation trial. An interested party is one who operates in the same product field or whose own rights are restrained by the target mark. Generic dislike of the mark is not enough — the petition must show why the petitioner is affected, with supporting documents.
- Lack of distinctiveness — generic or descriptive marks (art. 33)
- Identical or similar to a senior registered or filed mark (art. 34(1)(7))
- Likelihood of confusion with a famous or well-known mark (art. 34(1)(9), (11))
- Marks contrary to public order or morals (art. 34(1)(2), (4))
- Filing by a person without legal capacity or proper succession (art. 3)
Non-use Cancellation: The Most Common Weapon
A non-use cancellation clears registrations that exist on paper but not in the market. Per KIPO guidance, if neither the trademark owner nor any licensee has used the registered mark on the designated goods in Korea for three consecutive years before the filing date, anyone can request cancellation. Because standing is open, it is the first card to consider when a cited senior mark is blocking your new application.
Once filed, the burden of proving use shifts to the trademark owner. The owner must produce objective evidence — invoices, tax invoices, advertising, transaction records, web captures — showing use of the registered mark on the designated goods, in Korea, within the three-year window. Korean precedent rejects nominal or sporadic use that exists only to defeat cancellation.
Bad-faith Use and Other Cancellation Grounds
Cancellation grounds extend beyond non-use. Trademark Act article 119(1)(i) covers bad-faith use cancellation, where the owner intentionally uses a sign similar to the registered mark on the designated goods, or the registered mark on similar goods, in a way that confuses consumers about source or quality. Standing here is also open to anyone, and the rule prevents an owner from weaponising its registration to disrupt the market.
- Failure to supervise licensees (art. 119(1)(ii))
- Consumer deception or quality misrepresentation (art. 119(1)(i))
- Registering a treaty-country owner's mark without consent (art. 119(1)(vi))
- Breach of duties for collective or certification marks
- Use contrary to the rules of a collective mark
Effect of the Decision: Retroactive Void vs. Future Extinction
The decisive difference between the two trials is time effect. A final invalidation decision treats the trademark right as never having existed (Trademark Act art. 117(3)). Past infringement claims and licence revenue may then be recharacterised as unjust enrichment — a heavy downstream impact. A final cancellation decision, by contrast, extinguishes the right only from the date the decision becomes final, leaving past licences and damages untouched.
- Final invalidation
- Void ab initio Art. 117(3) — retroactive
- Final cancellation
- Extinguished going forward Past contracts unaffected
- Re-application bar
- 3 years post-cancellation Original owner and successors
- Petitioner's path
- May file a new application Effective once the decision is published
Cost and Timeline: A Practitioner's View
Costs split into the KIPO official fee and attorney fees. The official fee runs around KRW 50,000 per class with class-based add-ons, and a first-instance trial typically takes 9 to 12 months. Attorney fees vary widely with case complexity, evidence volume, and whether a foreign rights holder is involved, so most petitioners compare quotes before filing.
| Item | Range (illustrative) |
|---|---|
| KIPO official fee (1 class) | Around KRW 50,000 |
| Attorney fee | Varies widely with complexity |
| First-instance duration | 9-12 months on average |
| Appeal to Patent Court | Within 30 days of decision service |
Frequently Asked Questions
Q1. If 'anyone' can file, can a totally unrelated party do it?
Non-use cancellation has open standing, so no separate showing of interest is required. In practice, however, petitioners are usually parties whose new applications were rejected over the cited mark, or businesses whose operations are blocked by it. Petitions filed without any nexus risk being treated as abuse of process and may invite supplementary inquiries from IPTAB. Document why the target mark affects your business before filing.
Q2. If I receive an invalidation petition, must I file an answer?
Yes — failure to answer means the case proceeds on the petitioner's allegations alone, with a high risk of an adverse decision. The answer is normally due within 30 days, with extensions available for cause. Even if the alleged grounds look weak, no response is the worst option. It is standard practice to combine substantive defences with formal objections on standing and specificity.
Q3. Can the same mark be re-filed after cancellation?
The original owner (or its successors) cannot register an identical or similar mark for identical or similar goods for three years after the cancellation becomes final (Trademark Act art. 34(1)(viii)). During that period, the petitioner or a third party can step in and secure rights to the same mark, which is why parties often plan their own filing alongside the cancellation petition.
Q4. Can the case settle by agreement?
Yes. The petitioner can withdraw at any time, ending the case. After the answer has been filed, withdrawal requires the respondent's consent. Settlements often include licence or coexistence terms, so engage attorneys to review the agreement carefully. Without clear scope of use and goods coverage, the same dispute can resurface later.
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