Granted Patent
Utility
US 4,429,283 · App. 06/320,434
Differential current amplifier
Inventor:
Harold Allen Wittlinger
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Nov 12, 1981
Inventor
Harold Allen Wittlinger
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.