In a trademark opposition against Japan TM Reg no. 6894070 “Chemican” in Class 9, which disputed the similarity and a likelihood of confusion with the earlier mark “CHEMI-CON”, the Japan Patent Office (JPO) did not sustain the opposition due to the marks’ low degree of similarity even though the earlier mark to be famous in relation to aluminum electrolytic capacitors.
[Opposition case no. 2025-900082, decided on September 11, 2025]
CHEMICAN
Chemican, Inc. filed a trademark application for wordmark “Chemican” in standard character for use on various electrical and electronic goods, including capacitors of Class 9 with the JPO on December 9, 2024. [TM App no. 2024-132131]
Immediately after the filing, the applicant requested for accelerated examination.
Without raising any grounds for refusal, the JPO examiner granted protection of the mark on February 3, 2025. The mark “Chemican” was subsequently registered on February 6, 2025, and published for post-grant opposition on February 17.
Opposition by Nippon Chemi-Con Corporation
Nippon Chemi-Con Corporation, the largest manufacturer and supplier of aluminum electrolytic capacitors, has owned trademark registrations for the mark “CHEMI-CON” in Class 9 since 1984.

On April 16, 2025, Nippon Chemi-Con filed an opposition, disputing that the contested mark should be canceled in contravention of Article 4(1)(xi) and (xv) of the Japan Trademark Law.
Nippon Chemi-Con allegedly argued that the cited mark “CHEMI-CON” has become famous among relevant consumers of the goods in question, indicating a source of their aluminum electrolytic capacitors, which hold a top market share worldwide. The contested mark “Chemican” is confusingly similar to the cited mark “CHEMI-CON” in appearance and sound.
JPO decision
The JPO Opposition Board found that the cited mark has become famous as an indicator of the claimant’s aluminum electrolytic capacitors, considering the evidence and the claimant’s top-ranked global market share.
However, the Board questioned the similarity of the marks by stating that:
- Although both marks have the initial element “Chemi” and “CHEMI” in common, there are several differences: (i) a hyphen; (ii) “a” in “can” and “O” in “CON”; and (iii) the contested mark consists of lowercase letters except for the initial letter “C”, whereas the cited mark is entirely uppercase. Moreover, the cited mark can be recognized as a combination of the familiar English word “CHEMI,” meaning “chemical,” and the term “CON” via a hyphen. Therefore, the cited mark gives a different commercial impression than the contested mark. Accordingly, the two marks are clearly distinguishable in appearance.
- The two marks’ pronunciations differ in the third sound, with “ka” and “ko,” respectively. Bearing in mind that these sounds come just before the weak sound “n” at the end and that the overall sound structure consists of only four syllables, the two marks differ significantly in sound and appearance. Thus, the overall intonation and impression of these marks differ significantly, enabling clear distinction.
- A conceptual comparison is neutral, as neither mark has a clear meaning.
Based on the foregoing, the Board found that the contested mark is dissimilar to the cited mark, so it should not be vulnerable to cancellation based on Article 4(1)(xi).
Due to the low degree of similarity between the marks, the Board stated that relevant consumers are unlikely to confuse the source of the goods at question bearing the contested mark with the claimant, even if the cited mark is famous among consumers. For this reason, the Board dismissed the entire opposition.




















