The Trademark Office stipulates that trademarks that have not been used for three years will be revoked. Generally, the Trademark Office will not deliberately inquire. However, if a registered trademark has not been used for three consecutive years, anyone can apply to the Trademark Office of the State Administration for Industry and Commerce for cancellation of the registered trademark. After accepting the cancellation application, the State Trademark Office will send a letter to inform the registrant to provide evidence of use within the statutory time limit. If it is not provided in time, the trademark will be revoked.