From the USPTO:
The U.S. Department of Commerce’s United States Patent and Trademark Office (USPTO) in furtherance of the Global Dossier Initiative [recently] launched the first service for Global Dossier – Dossier Access.
Through Dossier Access, the public will be able to obtain data that is timely, reliable, understandable, standardized, and of high quality. Currently, the European Patent Office (EPO), Korean Intellectual Property Office (KIPO) and China’s State Intellectual Property Office (SIPO) provide a Global Dossier portal to the public. The Japan Patent Office (JPO) will be introducing Global Dossier in 2016.
From the Dossier Access Web Page
By using this service, users can see the patent family for a specific application, containing all related applications filed at participating IP Offices, along with the dossier, classification, and citation data for these applications. This service also provides Office Action Indicators to help users identify applications that contain office actions, a Collections View for saving documents and applications for review later on in the session, and the ability to download the documents in an application.
Direct to Dossier Access