Granted Patent
Utility
US 4,951,380 · App. 07/201,730
Waveguide structures and methods of manufacture for traveling wave tubes
Inventor:
Burton H. Smith
Patented Case
View Patent ↗
Granted: Aug 28, 1990
Filed: Jun 30, 1988
Inventor
Burton H. Smith
Assignee (at issue)
Raytheon 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.