Theoretically it is possible, but it depends on the scope of protection of the original patent. If the protection scope of the original patent is relatively large, then new applications within this protection scope will not be authorized through review, and some small improvements may be covered by the previous patent and cannot be authorized. Only by further restricting the technical features of the original patent and narrowing the scope of protection can authorization be possible. However, in this way, your technical content cannot be well protected. Therefore, how to set up a patent pool is very difficult.