Granted Patent
Utility
US 5,525,945 · App. 08/205,212
Dielectric resonator notch filter with a quadrature directional coupler
Inventors:
Mark C. Chiappetta, John S. Daukas
Patented Case
View Patent ↗
Granted: Jun 11, 1996
Filed: Jan 27, 1994
Inventors
Mark C. Chiappetta
John S. Daukas
Assignee (at issue)
LOCKHEED MARTIN 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.