Granted Patent
Utility
US 4,825,646 · App. 07/041,564
Spacecraft with modulated thrust electrostatic ion thruster and associated method
Inventors:
A. Dorian Challoner, Robert L. Poeschel
Patented Case
View Patent ↗
Granted: May 2, 1989
Filed: Apr 23, 1987
Inventors
A. Dorian Challoner
Robert L. Poeschel
Assignee (at issue)
Hughes Aircraft Company
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.