The following figures show the flow of procedures for a patent application and a divisional application after notification of 1st OA (office action) in Japan.
After receipt of 1st OA, it is necessary to pay attention to the deadline of a divisional application.  Therefore, we included the description of the timing of filing a divisional application in the figures.

Case 1:  The applicant received a notice of allowance

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Case 2:  The applicant received an examiner's decision of refusal

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