How to judge whether one's patent right has been infringed?

If someone else's product looks the same as yours, it's basically infringement. If the characteristics of the independent claim of your patent can be found in other people's products, then his products are infringing. For example, the independent claim of your utility model patent is characterized by features A, B and C, and the features of the products produced by an enterprise are A, B, C and D, then his products infringe your patent right, but if the features of his products are A, B or A and C, they are not. The most obvious are these two ways of judging. Of course, there is equivalent judgment, which needs to be analyzed in detail with several principles of tort judgment. Of course, in the process of safeguarding rights, you should also pay attention to the stability of your patent right, otherwise it is likely to be invalidated by others.