Granted Patent
Utility
US 5,213,152 · App. 07/787,941
Temperature control system for a heat detector on a heat exchanger
Inventor:
William C. Cox
Patented Case
View Patent ↗
Granted: May 25, 1993
Filed: Nov 5, 1991
Inventor
William C. Cox
Assignee (at issue)
ABB Air Preheater 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.