Granted Patent
Utility
US 4,936,260 · App. 07/297,589
Boiler or water heater with insulated water tank
Inventor:
Charles L. Adams
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Jan 17, 1989
Inventor
Charles L. Adams
Assignee (at issue)
PVI Industries, LLC
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.