Effective September 1, 2018, electronic retrievals of priority documents between the United States Patent and Trademark Office (USPTO) and the State Intellectual Property Office of China (SIPO) will be managed via the World Intellectual Property Organization (WIPO) Digital Access Service (DAS), in accordance with the WIPO DAS agreement established on April 20, 2009.
The direct electronic priority document exchange (PDX) program between the USPTO and the SIPO implemented by on October 8, 2014 will end then.
http://www.sipo.gov.cn/zfgg/1131094.htm
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