When a trademark becomes a common noun, that is, it has no distinctiveness, at this time anyone can request the Trademark Office to cancel the trademark application. Of course, the trademark owner can continue to use the trademark name. However, if the trademark is revoked by others to the Trademark Office on the grounds that it has become a common noun and the revocation is successful, the original trademark owner cannot prohibit others from using it. It’s time for a common noun. At this time, the original trademark applicant needs to obtain the registered trademark, or submit a review to the Trademark Office Review Committee or file a lawsuit with the People's Court. During the trademark case, he can apply for the recognition of the trademark as a well-known trademark. When it is recognized as a well-known trademark, When you apply for a trademark, you have great hope of retaining the trademark