usually six to eight months. Where the name, address or other registered items of a trademark registrant are changed, an application for change shall be submitted to the Trademark Office. After the approval of the Trademark Office, the trademark registrant shall be issued with corresponding certificates and announced; If it is not approved, it shall notify the applicant in writing and explain the reasons. Legal basis: Trademark Law of the People's Republic of China Article 41 Where a registered trademark needs to change the name, address or other registered items of the registrant, an application for change shall be filed.