Granted Patent
Utility
US 5,522,909 · App. 08/364,617
Air filter device
Inventor:
Clifford D. Haggard
Patented Case
View Patent ↗
Granted: Jun 4, 1996
Filed: Dec 27, 1994
Inventor
Clifford D. Haggard
Assignee (at issue)
Purolator Products NA, LLC
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.