Granted Patent
Utility
US 5,062,872 · App. 07/351,095
Air filter with horizontal filter elements
Inventor:
Roger D. Williams
Patented Case
View Patent ↗
Granted: Nov 5, 1991
Filed: May 12, 1989
Inventor
Roger D. Williams
Assignee (at issue)
Pneumafil Corporation
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.