What do I need to do to request that the USPTO electronically obtain a free copy of my JPO priority application through the priority document exchange program (PDX)?

PDX was deployed on July 28, 2007 between the USPTO and JPO. Accordingly, when an application is filed under 35 USC 111(a) on or after July 28, 2007, that includes a priority claim to a JPO application in an oath or declaration or in an Application Data Sheet (ADS), the USPTO will automatically attempt to retrieve an electronic copy of the JPO priority document through PDX.

USPTO FAQ - Questions and Answers (21APR2008)