What should I pay attention to when I find an agency to declare the patent invalid and fill in the power of attorney?

Patent number, patent name, patentee and the claimant for invalidation of invalid patent;

Name, telephone number and contact address of the customer;

The name of the entrusted agency and the name of the patent agent;

The power of attorney shall specify that the power of attorney is limited to matters related to the invalidation procedure.

The patent agent's agency authority:

(1) The agent of the patentee acknowledges the claimant's request for invalidation on his behalf;

(2) The agent of the patentee modifies the claim on his behalf;

(iii) the settlement is made by an agent.

(4) The agent of the claimant withdraws the request for invalidation on his behalf.