My patent has been infringed. Which department should I call? What's the phone number?

1. Send a lawyer's letter or warning letter. 2. Complain to the patent administration department (your local intellectual property office will have this department). 3. bring a lawsuit to the law. If through litigation or administrative means, it is necessary to provide corresponding evidence. This is for yourself. If you can't prove it, you can easily lose the case. You can go to the third party of Ecotech. Find a suitable intellectual property agency or law firm to consult and understand, and if necessary, ask them to help represent the lawsuit.