Granted Patent
Utility
US 4,512,289 · App. 06/614,978
Water heater with combination magnetic and agitator means
Inventor:
Denver G. Collins
Patented Case
View Patent ↗
Granted: Apr 23, 1985
Filed: May 29, 1984
Inventor
Denver G. Collins
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.