Law - PCT Chapter II Demand Due

A "Demand" for international preliminary examination under Chapter II of the PCT must be filed within 19 months of the priority date or the PCT filing date, whichever is earlier. Filing a Demand provides the significant benefit of extending by 10 months the deadline for filing national applications.

The position of the USPTO on this issue is described in the following section(s) of the Manual of Patent Examining Procedure (MPEP):

MPEP 1801 - Basic Patent Cooperation Treaty (PCT) Principles

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