What should the patentee do when he receives the notice of invalidation?

Generally, a defense is needed, otherwise the Patent Reexamination Board may make a decision against the patentee.

The defense affairs may be entrusted to a patent agency with patent agency qualification.

Please pay attention to the deadline for submission of defense documents.

You can contact me if you want to entrust a patent agency. I am in Zhongguancun, Beijing.