The cpc patent has been downloaded by others, so it is necessary to collect evidence to prove that you enjoy the patent right or the right to use the patent license, and to provide evidence to prove that others have committed or will commit patent infringement before making a complaint.
The United States and Europe announced the joint development of the joint patent classification system, or CPC for short, which was first published on 20 10 and 10/25. It is developed according to the standard and structure of the international classification system IPC, taking the European patent classification number ECLA as the basis of the whole classification system, and combining the successful practical experience of the US patent classification USPC, and is jointly managed and maintained by the European Patent Office and the US Patent and Trademark Office.