First of all, you need to carefully determine whether the patent is a duplicate patent, that is, whether the independent claim 1 of the two claims is substantially the same.
If so, confirm that your patent is duplicately authorized. The calculation time point for the other party to recover infringement compensation is from the date of its patent authorization, and the calculation standard will refer to the added value of the goods obtained by your "infringement".
In the "Answers to Several Issues Concerning the Trial of Patent Dispute Cases", the Supreme People's Court proposed the following three calculation methods regarding damages for patent infringement:
(1) Based on The actual economic losses suffered by the patentee due to infringement shall be regarded as the amount of loss compensation. The calculation method is: due to the decrease in sales of the infringing product (including products produced using other people's patented methods) on the market that infringes the patentee's patented product, the total reduction in sales is multiplied by the number of each patented product. The accumulation of profits is the actual economic loss of the patentee.
(2) All profits obtained by the infringer due to the infringement shall be used as the amount of loss compensation. The calculation method is: the profit obtained by the infringer from each infringing product (including products produced using other people's patented methods) multiplied by the total number of sales on the market is the total profit earned by the infringer.
(3) The amount of loss compensation shall be a reasonable amount no less than the patent license fee.
For the above three calculation methods, the people's court can choose to apply them according to the different circumstances of the case.