Granted Patent
Utility
US 4,378,521 · App. 06/311,489
Active zener diode substitute circuit
Inventor:
Richard W. Thorpe
Patented Case
View Patent ↗
Granted: Mar 29, 1983
Filed: Oct 15, 1981
Inventor
Richard W. Thorpe
Assignee (at issue)
General Dynamics Corp., Pomona Division
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.