https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/china/filing-grant/does-china-allow
Does China allow divisional applications?
Yes. Where an application contains two or more inventions, applicants may submit a divisional application on their own initiative or in accordance with an office action from an examiner. Divisional applications must be submitted on the basis of the initial application, no later than two months from the date of receipt of the notification of grant.
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