I replied to the notice of the first patent examination. It's been four months. Why hasn't it been notified?

Now the state of patent should be "substantive examination takes effect".

The substantive examiner of the patent application should be able to receive the documents related to the first examination opinions you replied. If the documents you submitted meet the requirements of content and format, they should be mailed to the State Administration of Justice in a formal way. But when the examiner will continue the trial depends on the examiner's work, and there is no time limit for replying to the documents you submitted. Therefore, there is no time limit for the National Bureau of Justice after you submit the documents in response to the review opinions.

If you are anxious to know the progress of the case now, you can call the public consultation number on the website of the State Administration Bureau and then consult the status according to the patent application number.