1. First of all, we have to pay attention to court summons, because we pay more and more attention to intellectual property rights, and the punishment standard for infringement is also improving, which must not be ignored;
2. The second step is to solve the problem of how to do it.
1) first judge whether there is infringement. Although the other party sued you for infringement, it is still unknown whether the product really belongs to the patent protection scope of the other party. This is one point. Infringement is not supported if it does not belong to the scope;
2) If it really belongs to the patent scope of the other party, you need to do two things, one is to stop selling immediately, and the other is to collect evidence to prove that the source of your purchase is legal and you don't know it;
3) The above work can be done by yourself. For professional reasons, it is recommended to entrust the intellectual property litigation team to do it. In addition, you can also communicate and cooperate with the manufacturer (because he is a manufacturer, if it involves infringement, the responsibility is greater) and find a lawyer to respond.