Granted Patent
Utility
US 6,723,150 · App. 10/090,058
Air filter with expandable filter media
Inventor:
Nathan P. Parker
Patented Case
View Patent ↗
Granted: Apr 20, 2004
Filed: Feb 28, 2002
Inventor
Nathan P. Parker
Assignee (at issue)
American Standard International 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.