https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/china/filing-grant/how-soon-after
How soon after filing an application in China do I need to file a request for examination?
You must submit a request for examination within three years of the filing date or, if priority is claimed, within three years of the priority date. If no request is filed within this time limit, the application is deemed to be withdrawn.
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