All the historical USPTO data is available as XML files. Here is the tree structure for the XML files:
-<clinical_study rank="61205">
:+<required_header>
:+<id_info>
:<brief_title>
:+<sponsors>:<source>:+<oversight_info>:+<brief_summary>:+<detailed_description>:<overall_status>Completed</overall_status>:<phase>Phase 1/Phase 2</phase>:<study_type>:<study_design>:<condition>:+<intervention>:+<eligibility>:+<location>:+<location_countries>:<verification_date>:<lastchanged_date>:<firstreceived_date>:<has_expanded_access>:+<condition_browse>:+<intervention_browse> Corresponding tables are:*assignment-records : assignment*patent-assignors : assignors*patent-assignees : assignees*patent-properties : properties