To be on the safe side, it is suggested that when the prosecution against the other party is invalid, the patent office should search first, that is, the patent search consulting center will issue a report, and you can judge whether the probability of winning the case is high according to this report.
In addition, there are three types of patents: invention, utility model and design. The invention is protected for 20 years, and the utility model and design are both 10 years, counting from the date of application. After this period, the patent itself will be invalid and there is no need to sue.
Besides, should we cancel inventions, utility models or designs? Because the invention is novel, creative and practical, there is no problem with the authorization, and it is difficult to cancel it.
I suggest you go to an intermediary. I hope it will be adopted. Thank you.