Yes, a trademark may still be invalidated after successful registration. The validity of a trademark can be challenged or invalidated within a period of time after registration. The following are some situations that lead to invalid trademark registration:

1. Objections from other trademark holders:

Other trademark holders can file objections after the trademark registration is successful, claiming that the trademark registration is invalid. The trademark conflicts with a trademark it owns. The trademark registration authority will review the objection and make a decision. If the opposition is successful, the trademark registration may be declared invalid.

2. Invalidity declaration by other trademark holders:

Other trademark holders can submit an invalidation declaration to the trademark registration agency after the trademark is successfully registered to prove that the trademark is registered is not eligible for registration at the time, for example because of the existence of a previously registered similar trademark or other legal issues. The trademark registration authority will review and decide whether to declare the trademark invalid based on the circumstances.

3. Trademark violates legal requirements:

If a trademark is found to violate legal requirements after registration, such as not using the trademark for a certain period of time, the trademark being abused, or the trademark being used misleadingly etc., the trademark registration may be declared invalid.

It should be noted that the invalidation procedures and requirements for trademark registration vary from country to country or region. After a trademark is successfully registered, if someone files an objection or declares it invalid, corresponding legal procedures and examinations will be required to determine whether the trademark is valid.

If you have further questions about the invalidity of trademark registration, it is recommended to consult a professional intellectual property lawyer, who can provide more detailed and specific guidance based on the specific situation.

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