Granted Patent
Utility
US 4,897,609 · App. 07/138,740
Axially coupled gyrotron and gyro TWTA
Inventor:
Raghuveer Mallavarpu
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Dec 28, 1987
Inventor
Raghuveer Mallavarpu
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.