Article 62 of the "Patent Law" stipulates: The statute of limitations for infringement of patent rights is two years, starting from the date when the patentee or interested party learns or should learn of the infringement. If the patentee knows or should know before the date of authorization, the statute of limitations shall be calculated from the date of patent authorization. There are two starting points for the statute of limitations in litigation: one is the date the patent is granted; the other is the date the patentee learns or should have learned of the act, with the later of the two starting points being the actual starting point.