Why a prior trademark search comes first

When you file a trademark in Korea, the first thing the KIPO examiner checks is similarity with prior marks. If a similar mark is already registered for identical or similar goods, registration is refused under Article 34(1)(7) of the Trademark Act (similarity to a prior-filed or registered mark).

This article covers (1) what costs you incur by skipping the search, (2) how examiners assess sound, appearance, and meaning, (3) practical traps like dominant-portion observation for composite marks, and (4) what AI search catches versus what still requires attorney judgment.

Three things that happen if you skip the search

Filing without a prior search typically leads to one of three scenarios. All three carry unilateral cost — KIPO official fees are never refunded, and attorney fees usually are not either.

• Refusal — If an identical or similar mark is already registered for identical or similar goods, Article 34(1)(7) bars registration. You can argue via response and amendment, but other than deleting designated goods or amending the mark, refusals are hard to overcome.
• Invalidation — Even if you slip past refusal and register, a prior rights holder can file an invalidation trial (Article 117) within five years and extinguish your right.
• Infringement — When the business grows, the rights holder can demand injunction (Article 107) and damages (Article 109). Article 110 even allows the infringer's entire profit to be presumed as the damage. Domain, signage, packaging, and marketing all need replacement.

How examiners judge similarity

Article 34(1)(7) similarity is judged across appearance, sound, and meaning. If any one dimension creates a likelihood of source confusion in trade, the marks are treated as similar. KIPO's examination guidelines call this objective, overall, and isolated observation.

In practice, overall observation is the default. For composite marks (multiple elements combined), examiners also apply dominant-portion observation (the part central to identification) and separate observation (per element).

Composite mark trap — dominant-portion observation

The Supreme Court has held that when a composite mark has a dominant portion shaping consumer perception, similarity can be judged on that dominant portion alone — without requiring the portion to be separable. Recent rulings (e.g., the November 20, 2025 decision) confirm this.

Goods similarity — the mark is not the only factor

Even if two marks are similar, refusal is avoided if the designated goods are dissimilar. Conversely, a slight mark difference can be refused when goods are identical or closely related. Goods similarity uses NICE classification but also actual trade reality.

What AI similarity search catches automatically

iphere's AI similarity search uses KIPRIS's getAdvancedSearch API to auto-generate queries and narrow candidates. It includes variant spellings you may not think of.

• Transliteration & compound variants — Latin marks rendered in Hangul phonetics, plus combinations with generic nouns and prefixes.
• NICE class & similarity group matching — Only registrations in the same NICE class and KIPO similarity-group codes (e.g., G0102) are surfaced and ranked.
• Risk grading — Sound/appearance/meaning similarity combined with goods distance, in high / medium / low bands.
• Examiner-perspective comments — The Opus model annotates each candidate with a one-line Article 34 grounds assessment.

A single search before mark selection prevents tens to hundreds of thousands of won in sunk cost and months of rebranding. The cheapest insurance is the one you buy first.