Granted Patent
Utility
US 5,209,428 · App. 07/521,211
Propulsion system for a vertical and short takeoff and landing aircraft
Inventors:
Paul Bevilaqua, Paul K. Shumpert
Patented Case
View Patent ↗
Granted: May 11, 1993
Filed: May 7, 1990
Inventors
Paul Bevilaqua
Paul K. Shumpert
Assignee (at issue)
Lockheed Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.