Granted Patent
Utility
US 4,642,522 · App. 06/621,420
Wire-ion-plasma electron gun employing auxiliary grid
Inventors:
Robin J. Harvey, Hayden E. Gallagher, Robert W. Schumacher
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Jun 18, 1984
Inventors
Robin J. Harvey
Hayden E. Gallagher
Robert W. Schumacher
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.