Granted Patent
Utility
US 4,527,543 · App. 06/283,983
Water heater construction
Inventor:
Donald W. Denton
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Jul 16, 1981
Inventor
Donald W. Denton
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.