https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/china/filing-grant/can-i-submit-0
Can I submit a request for a time limit extension with the Chinese Patent Office?
Yes, you can request extensions of time limits specified by examiners at the Chinese Patent Office if you are unable to perform a certain act or procedure within the time limit concerned. You must explain the reasons why you are asking for an extension and pay a fee. However, there are certain time limits which may not be extended.
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