https://www.epo.org/en/node/can-i-submit

Can I submit third-party observations on a Chinese patent application?

Yes. China has a similar third-party observations system to that of the European Patent Convention (EPC). Any person may submit observations on the lack of conformity of an application with the provisions of the patent law to the China National Intellectual Property Administration (CNIPA). This can be done at any time from the date of publication of the application to the announcement of the decision to grant.

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