What about the patent application for drugs (combining existing patented drugs with other drugs to synthesize new drugs)

1。 You can apply. If you only have these two functions, the probability of authorization is small, and if you have innovative functions, the probability of authorization is large.

2. Whether A's patent right is infringing must first determine whether A's patent right is stable, and any invention granted with patent right may be invalid. If A's patent right is stable and cannot be invalidated, it will violate A's patent right. If A's patent right is unstable, it can be invalid without infringing A's patent right. (Being invalidated means that the patent right is not considered to exist from beginning to end. )

3. If A's patent right is stable, then A should pay royalties to its patentee; If the patent right of A is unstable, there is no need to pay the patent fee.