Granted Patent
Utility
US 6,236,321 · App. 09/696,143
Clean out alert for water heaters
Inventor:
Henry E. Troost
Patented Case
View Patent ↗
Granted: May 22, 2001
Filed: Oct 25, 2000
Inventor
Henry E. Troost
Assignee (at issue)
HONEYWELL INTERNATIONAL 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.