Granted Patent
Utility
US 4,698,583 · App. 06/716,780
Method of monitoring a heater for faults
Inventor:
Chester Ledlie Sandberg
Patented Case
View Patent ↗
Granted: Oct 6, 1987
Filed: Mar 26, 1985
Inventor
Chester Ledlie Sandberg
Assignee (at issue)
Raychem Limited
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.