Trademark registration may be terminated in some cases, as follows:

1. Not renewed: The trademark registration certificate needs to be renewed within the validity period. If the trademark registrant fails to submit the renewal application or pay the renewal fee on time, the trademark registration may be terminated.

2. Voluntary waiver: A trademark registrant can voluntarily give up the right to register a trademark, that is, voluntarily give up the use and protection of the trademark. A trademark registrant may submit an application for waiver to the Trademark Office, and the right of trademark registration will be terminated after examination by the Trademark Office.

3. invalidation: when others think that the trademark registration is in violation of the provisions of the trademark law, such as the trademark is not independent, the distinctiveness is insufficient, or it is illegal or obscene, they can file an application for invalidation with the trademark office. If the Trademark Office determines that the trademark registration is invalid, the trademark registration will be terminated.

4. Trademark expired and unused: In some countries or regions, if the trademark holder fails to use the trademark within the specified time limit within a period of time after trademark registration, others may apply for trademark cancellation. If the Trademark Office determines that the trademark has expired and not been used, the trademark registration will be terminated.

5. Infringement or violation: If the trademark registrant infringes upon the rights and interests of others in the process of using the trademark, such as trademark infringement, trademark abuse, etc., the infringed party may file a cancellation application or complain. After examination, the Trademark Office determines that infringement or violation exists, and the trademark registration may be terminated.

The above situations are just some common situations of trademark registration termination, and the specific provisions on trademark registration termination may vary from country to country or region. Trademark registrants should abide by relevant laws and regulations when applying for trademarks, and safeguard the legitimate rights and interests of trademarks to avoid the termination of trademark registration.

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