Trademark invalidity and trademark revocation are two concepts. Trademark invalidity means that the trademark does not have the effect of a trademark from the beginning. This is usually due to the violation of the prohibitive provisions of the trademark law or the use of deception and deception at the beginning of registration. If a trademark is obtained through unfair means, the trademark will be deemed invalid. If a trademark is declared invalid, the trademark will not be protected by law from the date of application, and the trademark will have no legal effect. Trademark cancellation is the invalidation of an originally valid registered trademark due to improper use or expiration of the trademark use period. Trademark invalidity is caused by reasons at the time of registration, while trademark cancellation is usually caused by subsequent use. If a registered trademark has not been used for three consecutive years without justifiable reasons, any unit or individual may apply to the Trademark Office to cancel the registered trademark. Declaration of trademark invalidity For an approved registered trademark, within five years from the date of approval, the prior right holder or interested party believes that it has infringed upon prior rights or interests, or anyone believes that it has violated the prohibition of registration or caused adverse consequences. If there is any social impact, you can submit an invalidation declaration to the Trademark Review and Adjudication Board. Well-known trademarks are not subject to the five-year restriction.