The Trademark Law stipulates that if the company name or address is changed, the company's trademarks must be changed. If the company changes its name or address for more than one year without changing the trademark, the trademark will be invalid. Also, some communications from the Trademark Office are sent directly to the trademark registrant. For example, if someone mentions a trademark that has not been used for three years, if your address has not changed and you have not received a notice from the Trademark Office, you may not be able to respond in time. causing your trademark to be revoked. Therefore, when the registered trademark address changes, you must promptly submit a trademark change application to the State Trademark Administration.