Can be improved on the basis of others and used as their own patents, in fact, a large part of patents are improved patents;
The improved patent belongs to the "subordinate patent" of the basic patent. If you implement a patent, it will inevitably infringe the patent right of the original obligee, but if the original obligee wants to implement your patent, it will inevitably infringe your patent right, so you can allow the other party to implement the patented technology on the premise that the other party owns the patent.