Granted Patent
Utility
US 4,447,377 · App. 06/353,141
Method of insulating the exterior of a water heater tank
Inventor:
Donald W. Denton
Patented Case
View Patent ↗
Granted: May 8, 1984
Filed: Mar 1, 1982
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.