Granted Patent
Utility
US 5,785,844 · App. 08/637,853
End of life mechanism for water treatment cartridge
Inventors:
James L. Lund, David J. Emmons, Richard D. Hembree
Patented Case
View Patent ↗
Granted: Jul 28, 1998
Filed: Apr 25, 1996
Inventors
James L. Lund
David J. Emmons
Richard D. Hembree
Assignee (at issue)
Recovery Engineering, 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.