Pursuant to Rule 54bis PCT, the demand may be validly submitted at any time prior to expiry of whichever of the following periods expires later:
R. 54bis PCT
WIPO PCT Guide 10.010
three months from the date of transmittal to the applicant of the ISR and WO-ISA by the ISA, or
22 months from the (earliest) priority date.
Date retrieved: 02 November 2015