Granted Patent
Utility
US 5,668,442 · App. 08/242,570
Plasma-assisted tube with helical slow-wave structure
Inventors:
Dan M. Goebel, Jennifer M. Butler, Robert L. Eisenhart
Patented Case
View Patent ↗
Granted: Sep 16, 1997
Filed: May 13, 1994
Inventors
Dan M. Goebel
Jennifer M. Butler
Robert L. Eisenhart
Assignee (at issue)
HUGHES ELECTRONICS LIMITED
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.