https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/china/after-grant/can-lapsed-patent
Can a lapsed patent be restored in China?
In China you can request restoration of a patent within two months from the date of receipt of the notification of lapse. You must give reasons for your request and pay a restoration fee. Under certain conditions of force majeure, restoration may be requested up to two years from the date of expiry of the time limit for payment.
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