Granted Patent
Utility
US 5,020,512 · App. 07/065,140
Water heater construction and method of heating water
Inventors:
Otto Z. Vago, Ernest Wenczl
Patented Case
View Patent ↗
Granted: Jun 4, 1991
Filed: Jun 24, 1987
Inventors
Otto Z. Vago
Ernest Wenczl
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.