In an invalidation action disputing the validity of TM Reg no. 6637032 for the word mark “BIYŌMA” in class 3 due to its similarity to the earlier IR no. 1633315 for the word mark “BYOMA”, the Japan Patent Office (JPO) found BYOMA and BIYŌMA to be dissimilar.
[Invalidation case no. 2023-890015, gazette issued on May 30, 2025]
TM Reg no. 6637032
The contested mark, consisting of the word “BIYŌMA” in a plain font (see below), was filed with the JPO for use on cosmetics of class 3 in particular and various goods in classes 21, 24, 25 and 30 on March 17, 2022, by TSUKAMONO CORPORATION. [TM App no. 2022-30868]

The JPO examiner notified a refusal ground that states the mark is unregistrable due to a conflict with IR no. 1633315 for word mark “BYOMA” based on Article 4(1)(xi) of the Japan Trademark Law. The applicant filed a response in which they argued dissimilarity of mark.
Eventually, the examiner withdrew his refusal and granted protection of the mark on September 30, 2022.
The applicant promotes body cream, body soap, hand cream, and lip stick displaying the mark “BIYŌMA”.
Invalidation action by BYOMA Limited
BYOMA Limited, the owner of IR no. 1633315 “BYOMA”, filed an application for a declaration of partial invalidation to the contested mark on March 14, 2023 with the JPO in contravention of Article 4(1)(xi) of the Trademark Law, and disputed similarity between “BYOMA” and “BIYŌMA” in relation to cosmetics of class 3.

BYOMA Limited argued that the contested mark resembles the cited mark because it contains all of the letters that constitute the cited mark, and the difference in the second letter, “I,” is trivial. A conceptual comparison is neutral as both marks have any clear meaning. Besides, taking account of aural similarity, the contested mark should be considered similar to the cited mark.
JPO decision
On October 2, 2024, the JPO Invalidation Board dismissed the invalidation petition by stating that:
Visual Comparison
Although the contested mark and the cited mark contain the same letters “B,” “Y,” “O,” “M,” and “A”, there are differences in the presence or absence of the letter “I” in the second character and the hyphen in the letter “O.” These differences have a significant impact on the overall visual impression of the contested mark. Especially, when comparing the relatively short constituent characters of six and five letters. Therefore, both marks are clearly distinguishable in appearance.
Aural Comparison
There is a difference between “biyo” and “byo” in the initial sound, which is an important element in distinguishing the pronunciation. In the comparison of the short constituent sounds of four or three syllables, these differences affect the overall pronunciation of the two marks. Even when pronounced consecutively, the tone and feeling of the pronunciations differ to the extent relevant consumers can easily distinguish them phonetically.
Conceptual Comparison
The conceptual aspect does not have impact on the assessment of similarity, since both marks are meaningless.
Based on the foregoing, the Board decided that the contested mark is dissimilar to and unlikely to cause confusion with the cited mark even when used on the goods in question.