Patents have timeliness and monopoly. However, the examination and approval of utility model patents is very loose, that is to say, if you think it is similar to his patent, but you have your own advanced place, you can or may apply for a patent successfully. However, if you invalidate his patent, I'm sorry, but I suggest you cancel the plan. He applied for it first (the prescription and the prescription are unreasonable), and the invention you studied has not been published in some influential books or exhibitions, so even if it is stipulated by law,
Then, there is the question of saving, because although it is controversial, you have your own advanced nature. It is suggested that the market be registered and put into production. Because in China, the conclusions of such cases are varied, and a large part of them will go away. Unless the evidence is particularly sufficient, a judgment will be made, and the judgment will take a long time. You know, the validity period of a patent is limited, and it will be very troublesome if it exceeds it.
I wish you success, meanwhile, the patentee.