Granted Patent
Utility
US 4,458,216 · App. 06/304,690
Switched-capacitor modulator for quadrature modulation
Inventor:
John A. C. Bingham
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Sep 22, 1981
Inventor
John A. C. Bingham
Assignee (at issue)
Racal-Vadic, Inc.
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.