Granted Patent
Utility
US 4,558,360 · App. 06/538,259
Decoder lockout defeat circuit
Inventors:
Melvin C. Hendrickson, Robert L. Sproston, Jr.
Patented Case
View Patent ↗
Granted: Dec 10, 1985
Filed: Oct 3, 1983
Inventors
Melvin C. Hendrickson
Robert L. Sproston, Jr.
Assignee (at issue)
Zenith Electronics LLC
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.