PCT Receiving Office Guidelines
Chapter VII: Priority Claims and Priority Documents
Effect of a Change of Priority Date
192. Where the priority date of the international application has changed following a correction or addition of a priority claim under Rule 26bis, any date which is computed from the original priority date and which has not already expired is computed from the priority date resulting from that change, but time limits computed from the original priority date and which have already expired are not reinstated (Rule 26bis.1(c)).