The application process is as follows
Application-preliminary examination-publication-substantive examination-examination opinions-authorization;
In general, it is the above process. Generally, the Patent Office issues 2-3 review opinions, and subsequent ones that fail to pass the Patent Office will be rejected.
It is suggested that the patent search in the early stage of application is similar or similar, and the late application can improve the pass rate and avoid being rejected by the patent office;
You can find a qualified institution to handle it. You can search for approximation in the early stage and have tracking and monitoring services in the later stage.