Trademark Act Article 57

Grounds for invalidation; proof of use of earlier trademarkAn interested party may file invalidation with the Registrar Office, or a trademark examiner may submit a proposal to the Registrar Office for invalidation, against a trademark registration on the grounds that such registration falls under Paragraph 1 of Article 29, Paragraph 1 of Article 30, or Paragraph 3 of Article 65.An applicant who file an invalidation with the Registrar Office against a trademark registration on the grounds that such registration falls under Subparagraph 10 of Paragraph 1 of Article 30 shall furnish proof that, during the period of three years preceding the date of the application for invalidation, the earlier trademark has been used in connection with the goods or services in respect of which it is registered and which he/she cites as justification for his/her application, or that there are proper reasons for non-use, provided the earlier trademark has at that date been registered for not less than three years.The proof of use furnished pursuant to the preceding paragraph shall be capable of establishing the genuine use of the trademark in accordance with general commercial practices.