Granted Patent
Utility
US 4,398,064 · App. 06/335,004
Call-for-service and continuity sensor circuit
Inventor:
Edward A. Formosa, Jr.
Patented Case
View Patent ↗
Granted: Aug 9, 1983
Filed: Dec 28, 1981
Inventor
Edward A. Formosa, Jr.
Assignee (at issue)
GTE Automatic Electric Labs 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.