How to inquire about the validity of patent?

What is formal and legally binding should be to ask China National Intellectual Property Administration for a copy of the patent register.

Download 10003 1 "Request for Copying Documents" in the "Office Area and Form Download" column of China National Intellectual Property Administration website, fill it out and send it to the certification office of the first instance department of China National Intellectual Property Administration, No.6, West Tucheng Road, Jimenqiao, Haidian District, Beijing (postal code 10088).