Trademark registration may be declared invalid and revoked under certain circumstances. The following are some common situations in which trademark registrations are invalid and revoked:

1. Lack of distinctiveness: Trademark registration may be revoked if the trademark lacks sufficient distinctiveness, that is, it cannot be clearly distinguished from other trademarks . A trademark should be distinctive and distinctive enough to enable it to identify and distinguish particular goods or services.

2. Deceptive: Trademark registration may be revoked if the mark is misleading or deceptive. Trademarks should not misunderstand or mislead consumers, especially regarding the nature, quality, geographical origin, etc. of goods or services.

3. Lack of use: Trademark registration may be revoked if the trademark is not actually used within a period of time after registration. Many countries and regions require trademarks to be actually sold for goods or services within a certain period of time after registration, otherwise they may face the risk of invalidation and cancellation.

4. Conflict with existing trademarks: Trademark registration may be revoked if the trademark conflicts with an existing trademark, including being too similar to an existing trademark or likely to cause confusion. The trademark registration agency will conduct a similarity comparison and evaluation to determine whether the trademark conflicts with an existing trademark.

5. Violation of regulatory requirements: Trademark registration may be revoked if the trademark registration application violates the requirements of the Trademark Law during the application process, such as providing false information, using other people's trademarks without authorization, etc.

These are some common situations in which trademark registrations are invalid and revoked. The specific situations may vary from country to country and region to region. The invalidation and cancellation procedures of trademark registration usually need to be heard and decided by the trademark registration agency or the court.

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