Granted Patent
Utility
US 4,437,056 · App. 06/249,581
Cab signal test set for automatically testing the pickup coils and checking an amplifier of cab signal equipment
Inventor:
Joseph J. Pierro, Jr.
Patented Case
View Patent ↗
Granted: Mar 13, 1984
Filed: Mar 31, 1981
Inventor
Joseph J. Pierro, Jr.
Assignee (at issue)
American Standard 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.