How to inform the other party of patent infringement? Our product has been patented, and now it is found that someone is copying our product. How should I inform the other party?

First of all, you need to confirm the validity of your patent (do you still have the patent certificate and annual fee invoice? ) and stability (if it is a utility model or design patent, it is recommended to apply for a "patent evaluation report" at the State Patent Office first).

Secondly, buy other people's products and compare them with their own patents to determine whether they are infringing. It is best to consult professionals, such as lawyers or patent agents in intellectual property.

Again, of course, we are going to sue for evidence, and we usually buy products suspected of infringement through notarization.

It is best to find a lawyer to prepare a complaint and file a case in court.