Legal analysis: the limitation of action for infringement of intellectual property rights is 3 years, counting from the date when the obligee knows or should know. If the owner of the patent right, trademark right or copyright has sued for more than 2 years, if the intellectual property right is still within the protection period, the people's court shall order the defendant to stop the infringement; The amount of compensation for infringement damages shall be calculated three years from the date when the obligee brings a suit in a people's court.

legal basis: article 188 of the civil code of the people's Republic of China requests the people's court for protection of civil rights, and the limitation period is three years. Where there are other provisions in the law, such provisions shall prevail. The limitation period of action shall be counted from the day when the obligee knows or should know that the right has been damaged and the obligor. Where there are other provisions in the law, such provisions shall prevail. However, if more than 2 years have passed since the right was damaged, the people's court will not protect it. Under special circumstances, the people's court may decide to extend it according to the application of the obligee.