Granted Patent
Utility
US 4,496,250 · App. 06/471,914
Thermocouple open circuit detector
Inventor:
Thomas J. Walsh
Patented Case
View Patent ↗
Granted: Jan 29, 1985
Filed: Mar 3, 1983
Inventor
Thomas J. Walsh
Assignee (at issue)
Federal Signal 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.