Granted Patent
Utility
US 4,889,105 · App. 06/877,701
Water heater construction and method of manufacture
Inventors:
Otto Z. Vago, Ernest Wenczl
Patented Case
View Patent ↗
Granted: Dec 26, 1989
Filed: Jun 20, 1986
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.