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Recently, the State Intellectual Property Office of China (SIPO) relaunched its "China Patent Inquiry System", which now also offers the possibility to inspect the files of IP5 family members. Under the new name "China and Global Patent Examination Inquiry", the system now includes a new section which lists all family members of the corresponding Chinese application. For those applications also filed at the JPO, KIPO, USPTO and EPO, links to the online files of these offices are provided. Furthermore, a new section on fee payment information in English has been added. The source is updated on a weekly basis and covers Chinese patent, utility model and design applications filed on or after 10 February 2010.
A step-by-step search guide which explains in detail how to use this system is available on the EPO's Asian patent information webpages.