Among these two interdependent patents, the first one is protected by patent. It is the basis of another patent invention, or the latter patent is an improvement on the basis of prior patent protection, and the latter is a subordinate and improved patent of the former, and the former is called a basic patent.
In international technology trade, the owner of the basic patent controls the patent implementation of the subordinate patent owner and grants the patent license to others. If the subordinate patentee wants to implement or license others to implement, it must obtain the consent of the basic patentee in advance, otherwise it will constitute an infringement of the rights of the basic patentee.
Any patent related to its subject matter granted after the basic patent. Such as increasing patents, improving patents, importing patents, registering patents, etc., are all based on basic patents. The exploitation of these patents without the consent of the basic patentee constitutes infringement. The basic patent is revoked or declared invalid. The patent related to it is invalid.