1. How long is the period for invalidation of applications for squatting trademark registration? If the registered trademark has been approved for registration after the 3-month announcement period, at this time the company can rely on the "Trademark According to the provisions of Article 45 of the Law, the Trademark Review and Adjudication Board of the State Administration for Industry and Commerce is requested to declare the registered trademark invalid. The Trademark Law has a 5-year time limit for invalidation applications. That is, if a trademark has been registered for more than 5 years, it cannot apply for invalidation on the grounds of preemptive registration (well-known trademarks are not subject to this time limit). If any party is dissatisfied with the Trademark Review and Adjudication Board's ruling, it can also file an administrative lawsuit with the People's Court. 2. How to apply for trademark squatting to be declared invalid? When the Trademark Office makes a decision to declare a registered trademark invalid, it shall notify the parties in writing. If the party concerned is dissatisfied with the decision of the Trademark Office, he may apply to the Trademark Review and Adjudication Board for review within fifteen days from the date of receipt of the notice. The Trademark Review and Adjudication Board shall make a decision within nine months from the date of receipt of the application and notify the parties in writing. If there are special circumstances that require an extension, it can be extended for three months with the approval of the industrial and commercial administration department of the State Council. If the party concerned is dissatisfied with the decision of the Trademark Review and Adjudication Board, it may file a lawsuit with the People's Court within thirty days from the date of receipt of the notice. If other units or individuals request the Trademark Review and Adjudication Board to declare a registered trademark invalid, the Trademark Review and Adjudication Board shall, after receiving the application, notify the relevant parties in writing and file a reply within a time limit. The Trademark Review and Adjudication Board shall make a ruling to maintain the registered trademark or declare the registered trademark invalid within nine months from the date of receipt of the application, and notify the parties in writing. If there are special circumstances that require an extension, it can be extended for three months with the approval of the industrial and commercial administration department of the State Council. If the party concerned is dissatisfied with the ruling of the Trademark Review and Adjudication Board, it may file a lawsuit with the People's Court within thirty days from the date of receipt of the notice. The people's court shall notify the other party in the trademark adjudication procedure to participate in the litigation as a third party. To sum up, if the trademark being used by an enterprise is registered by others before it is registered, if the trademark publicity period has passed, the enterprise can apply to the Trademark Office to declare the trademark invalid within five years from the date of registration. One situation needs to be distinguished here. If a well-known trademark is preemptively registered, it is not subject to the five-year statute of limitations. If the party concerned is dissatisfied with the Trademark Office's ruling, it can initiate a reconsideration within half a month.