https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/china/filing-grant/can-chinese

Can Chinese utility model patents be converted into invention patents?

Utility models cannot be converted into invention patents in China. However, the dual filing of applications for invention patents and utility models is possible to obtain early protection. Upon notification of grant of the patent, the utility model must be abandoned.

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