IP5 - the European Patent Office (EPO), the Japan Patent Office (JPO), the Korean Intellectual Property Office (KIPO), the State Intellectual Property Office (SIPO) and the United States Patent and Trademark Office (USPTO) - launched the PPH pilot program on January 6, 2014. Its duration was three years, and was scheduled to expire on January 5, 2017. Now it is extended for another three years to January 5, 2020.

http://english.sipo.gov.cn/news/official/201701/t20170113_1307793.html