Granted Patent
Utility
US 6,402,822 · App. 09/504,518
Furnace filter system
Inventor:
Joseph L. Najm
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: Feb 15, 2000
Inventor
Joseph L. Najm
Assignee (at issue)
HMI Industries, 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.