Granted Patent
Utility
US 4,807,355 · App. 07/201,803
Method of manufacture of coupled-cavity waveguide structure for traveling wave tubes
Inventor:
Robert Harper
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Jun 3, 1988
Inventor
Robert Harper
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.