Granted Patent
Utility
US 4,635,006 · App. 06/683,237
Adjustable waveguide branch directional coupler
Inventor:
Krishna Praba
Patented Case
View Patent ↗
Granted: Jan 6, 1987
Filed: Dec 18, 1984
Inventor
Krishna Praba
Assignee (at issue)
RCA 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.