Granted Patent
Utility
US 4,733,530 · App. 06/892,559
Emission current control system for multiple hollow cathode devices
Inventors:
John R. Beattie, Donald J. Hancock
Patented Case
View Patent ↗
Granted: Mar 29, 1988
Filed: Aug 4, 1986
Inventors
John R. Beattie
Donald J. Hancock
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.