What if the patent is declared invalid by others?

Can pass the patent reexamination link. After the applicant's application for invalidation of the patent right is accepted by the Patent Application Reexamination Board, the applicant may supplement, modify or add evidence within one month from the date of acceptance, and if new evidence is provided or the original evidence is modified or supplemented beyond the prescribed one-month period, the Patent Application Reexamination Board may not consider it.