Granted Patent
Utility
US 5,160,608 · App. 07/763,931
High efficiency water treatment system
Inventor:
William W. Norton
Patented Case
View Patent ↗
Granted: Nov 3, 1992
Filed: Sep 23, 1991
Inventor
William W. Norton
Assignee (at issue)
CULLIGAN INTERNATIONAL COMPANY
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.