Legal analysis: Invalid trademarks are divided into two categories: 1, and disputes caused by the conflict between the registration of a trademark and a previously registered trademark. This kind of dispute usually occurs between two identical or similar trademarks used on the same or similar goods. For this kind of trademark dispute, China's Trademark Law stipulates a dispute period of five years from the date of registration. 2. Invalid trademark refers to the dispute caused by the fact that the trademark registration violates the prohibitive norms required by the registered trademark according to law, or the registration applicant obtains the registration by deception or other improper means. The so-called violation of the prohibitive norms of trademark registration mainly means that the trademark pattern is not obvious, which violates public order and good customs or good customs. For the second kind of trademark dispute, China's Trademark Law does not stipulate the time limit for filing trademark disputes. In other words, there is no time limit for this kind of trademark invalidation, and the trademark invalidation can be filed at any time.

Legal basis: Trademark Law of People's Republic of China (PRC).

Article 22 An applicant for trademark registration shall fill in the category and name of the goods using the trademark in accordance with the prescribed commodity classification table and apply for registration.

An applicant for trademark registration may apply for the registration of the same trademark for many kinds of goods through one application.

Applications for trademark registration and other relevant documents may be submitted in written form or in the form of data messages.

Article 28 The Trademark Office shall, within nine months from the date of receiving the application documents for trademark registration, complete the examination of the trademark applied for registration, and if it meets the relevant provisions of this Law, make a preliminary examination and approval announcement.

Article 40 Where a registered trademark needs to be used continuously after the expiration of its term of validity, the trademark registrant shall go through the renewal procedures in accordance with the provisions within 12 months before the expiration; If it has not been handled during this period, it can be extended for six months. The validity period of each renewal registration is ten years, counting from the day after the last expiration of the trademark. If the renewal formalities are not completed at the expiration of the period, the registered trademark shall be cancelled.

The Trademark Office shall announce the renewed registered trademark.