How to deal with the change and cancellation of patent implementation contract filing, and what should be paid attention to?

Application form for filing and cancellation of patent licensing contract;

(2)

Agreement on the completion or early termination of the patent licensing contract;

(3)

Power of attorney for licensor and licensee to handle relevant formalities with the entrusted agent;

(4)

Copy of the agent's ID card;

(5)

Original record certificate of patent licensing contract