I want to apply for an improved patent for X after patent X (Y has independent B, C and D in performance).

In this Y-weight 1, BCD is independent of each other, so this writing means that the three technical schemes of ab, ac and ad will be considered as not unitary. If there is no relationship between the three characteristics of BCD, then the best way is to apply for three patents. If not, write in order of importance, such as

1 A Y includes: a, which is characterized by B.

2. Y according to claim 1, characterized by further comprising C. ..

3. Y according to claim 2, characterized in that c has c 1c2c3.

4. Y according to claim 1-3, characterized by further comprising D. ..

5. Y according to claim 4, wherein the d includes d 1, d2 and d3.

As for z, it will not be unauthorized because it contains be. If e is an innovative technical feature, it will also be authorized. So it's impossible without authorization. At the time of implementation, if its technical scheme is abe, and the ab in it infringes your patent right, then he can't implement abe's patent. If the patent of the other party is be instead of abe, then the implementation of be is still not infringing.