Granted Patent
Utility
US 5,830,367 · App. 08/764,676
Method of using indicator means for liquid purification filter
Inventor:
Elizabeth Deibler Gadsby
Patented Case
View Patent ↗
Granted: Nov 3, 1998
Filed: Dec 11, 1996
Inventor
Elizabeth Deibler Gadsby
Assignee (at issue)
Kimberly-Clark Worldwide, 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.