After the company name is changed, the trademark change is usually processed within one month. If the registration matters change, the trademark registrant shall submit a change application, and shall not change the registration matters without the change. A company's trademark change can be handled by itself, or it can be entrusted to a legally established trademark agency.
Legal Basis
Article 18 of the Trademark Law of the People's Republic of China
You can apply for trademark registration or handle other trademark matters by yourself , or you can entrust a legally established trademark agency to handle the matter. When foreigners or foreign enterprises apply for trademark registration and handle other trademark matters in China, they should entrust a trademark agency established in accordance with the law to handle it.
Article 41
If a registered trademark needs to change the name, address or other registration matters of the registrant, a change application shall be submitted.