Consult the upper concept of patent application

1, incorrect. Although A may be a technology further created on B's technical scheme, it is a new technology, and the realization of this technical scheme does not need to realize B's technical scheme first, so it does not need B's permission.

2. It may exist. If B does not have the technical characteristics of C, but can achieve the effect brought by the technical characteristics of C, or can achieve the effect that A's other technical solutions can't bring, then he is novel and creative and can be authorized.

Your understanding of the upper concept is wrong. It doesn't mean that the generalization range of A is larger than that of B, then A must be the technical scheme of B. A typical example of the upper and lower concepts is the upper concept that metal is iron. Moreover, the concept of upper and lower positions is only aimed at technical characteristics, not the whole technical scheme. In your case, if the technical feature of A is abc, B is abd and D is the superordinate concept of C, then if A applies first, B cannot be authorized because it is not novel.

I don't know. Do you understand what I said?