What if the products developed by individual companies are patented by others before registration? Can I sue him? Products have original design paper and molds.

Hello, if you find that a patent plagiarizes the existing technology or design, you can file a request for invalidation of the patent with the Patent Reexamination Board of China National Intellectual Property Administration Patent Office, and at the same time provide corresponding evidence, including the fact that its technology or design existed before the patent application date, such as sales evidence, objects and pictures of similar products, etc. According to the evidence, the Patent Reexamination Board will send a notice to the patentee asking him to reply. If it fails to reply or refute within the time limit, the patent shall be invalid.