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 also provide evidence to prove that others have committed or will commit patent infringement to make a complaint.
the United States and Europe announced the joint patent classification system, or CPC for short, which was first published on October 25th, 21. It was developed according to the standards and structure of the international classification system IPC, based on the European patent classification number ECLA, and combined with the successful practical experience of the US patent classification USPC, it was managed and maintained by the European Patent Office and the US Patent and Trademark Office.