Granted Patent
Utility
US 6,491,735 · App. 09/988,271
Furnace filter system
Inventor:
Joseph L. Najm
Patented Case
View Patent ↗
Granted: Dec 10, 2002
Filed: Nov 20, 2001
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.