I have provided a patent registration certificate, but why my authentication request of patent information was rejected based on the reason that the patent is invalid due to the expiration of the patent?
There is a protection period for each type of patent rights. According to article 42 of the PRC Patent Law, the valid protection period for invention patents is 20 years, 15 years for design patents and 10 years for utility model designs, which is calculated from the patent application date indicated on the patent certificate).
If the patent protection period of a patent has expired, the patent will become invalid, and we are unable to process your patent authentication request. To check the status of a patent, you could sign in the website of National Intellectual Property Administration of the PRC (previously referred to as“SIPO”) at http://cpquery.sipo.gov.cn/.