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On 6 February 2019, the Japan Patent Office (JPO) published a draft of the Examination Guidelines for Patent Term Extensions for public comment. An extension of the patent term might also become possible as compensation for a curtailment of the term, in case the granting procedure took more than five years from date of filing or three years from date of request for examination (whichever date is later).
The public has been invited to send comments until 8 March 2019. For more details, please refer to the JPO's English website.