Granted Patent
Utility
US 6,290,848 · App. 08/843,458
Filter cartridge for gravity-fed water treatment devices
Inventors:
John Tanner, David J. Emmons
Patented Case
View Patent ↗
Granted: Sep 18, 2001
Filed: Apr 16, 1997
Inventors
John Tanner
David J. Emmons
Assignee (at issue)
PUR Water Purification Products, 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.