Granted Patent
Utility
US 4,641,778 · App. 06/720,856
Electronic water heater thermostat system
Inventor:
David Dodson
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Apr 8, 1985
Inventor
David Dodson
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE 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.