Granted Patent
Utility
US 4,290,140 · App. 06/050,795
Combined coherent frequency and phase shift keying modulation system
Inventor:
Robert E. Malm
Patented Case
View Patent ↗
Granted: Sep 15, 1981
Filed: Jun 21, 1979
Inventor
Robert E. Malm
Assignee (at issue)
Northrop Corporation
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.