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On 15 March 2019, the Patent Re-examination Board of the China National Intellectual Property Administration (CNIPA) was re-named to Re-examination and Invalidation Department of the Patent Office, CNIPA. According to a notification on the website, new Chinese and English versions of the website have recently been launched. The previous URLs are no longer accessible and bookmarks should be updated.
A free step-by-step search guide on how to search for re-examination and invalidation decisions can be found in the Asian patent information section on the EPO website.