Granted Patent
Utility
US 4,800,281 · App. 06/922,582
Compact penning-discharge plasma source
Inventor:
Weldon S. Williamson
Patented Case
View Patent ↗
Granted: Jan 24, 1989
Filed: Oct 24, 1986
Inventor
Weldon S. Williamson
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.