Granted Patent
Utility
US 4,838,211 · App. 07/188,168
Water heater construction and method of heating water
Inventor:
Otto Z. Vago
Patented Case
View Patent ↗
Granted: Jun 13, 1989
Filed: Apr 28, 1988
Inventor
Otto Z. Vago
Assignee (at issue)
State Industries, 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.