Granted Patent
Utility
US 6,377,171 · App. 09/396,915
On-line filter monitoring system
Inventor:
Kenneth J. Fewel
Patented Case
View Patent ↗
Granted: Apr 23, 2002
Filed: Sep 15, 1999
Inventor
Kenneth J. Fewel
Assignee (at issue)
PEERLESS MFG. CO
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.