From January 1, 2014, the State Intellectual Property Office (SIPO) of China has launched the China-Korea Electronic Priority Document Exchange Service based on Rule 31 of the Rules for the Implementation of the Patent Law of the People's Republic of China and an agreement between SIPO and the Korean Intellectual Property Office (KIPO).  The service provides that:

If an applicant first filed a patent application with SIPO, and then files another patent application with KIPO on the same invention and claims priority, KIPO will retrieve by itself a copy of the priority application from SIPO.  And conversely, a copy of a priority application from KIPO can be obtained by SIPO, if the patent application is filed with KIPO and then SIPO along with its priority claim.

Copies of priority applications received by SIPO through suchservice will be deemed as the required documents submitted for the priority claims under the provisions of Article 30 of the China Patent Law.  If SIPO fails to obtain the copy of the priority application within the specified term under the China Patent Law,the applicant will be timely notified to hand in a certified copy of the prior application issued by KIPO within 2 months upon the receipt of such notice.

The service is applicable to invention or utility model applications submitted on or after January 1, 2014, but not applicable to any PCT applications according the Patent Cooperation Treaty or the priority claims based on aPCT application.  Charge of this service of SIPO is waived.

Source: SIPO’s website