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In a case where the PCT national phase 30 month date has already passed, there is no way to enter this PCT application into the national phase in Japan.
There is no way to disclaim the earliest priority date at the national office level (at the Japanese Patent Office). Also, it is no longer possible to withdraw a claim of priority in the international stage according to PCT Rule 90 bis. 3. Such a request should have been filed within 30 months from the earliest priority date.