In Japan, an applicant may file a divisional patent application
(in accordance with Patent Act Art. 44). This is possible from the
filing of the application until prescribed deadlines.
When is the latest I may file a divisional application after
the JPO grants my patent?
The JPO's Decision to Grant a Patent transmittal date
triggers a thirty-day window for filing a divisional application.
By the end of the thirty days the applicant must file any
divisional application(s) desired. Please note that this is only
viable for applications that was filed after April 1, 2007. (Most
likely this applies to yours, but be sure to check!)
Please note that a divisional application must be filed within
30 days from the transmittal date of the Decision to Grant a Patent
and before the registration fee is paid. Once you have
paid the Issue Fee, it is not possible to file a divisional
application, so at the latest the divisional application needs to
be filed along with the Issue
