Granted Patent
Utility
US 5,171,430 · App. 07/701,901
Plastic filter
Inventors:
Donald W. Beach, Udo E. Holzhausen, Lawrence B. Feldhaus, Charles L. Matheson, Monroe L. Newton, Steve F. Robbins, William F. Langford
Patented Case
View Patent ↗
Granted: Dec 15, 1992
Filed: May 17, 1991
Inventors
Donald W. Beach
Udo E. Holzhausen
Lawrence B. Feldhaus
Charles L. Matheson
Monroe L. Newton
Steve F. Robbins
William F. Langford
Assignee (at issue)
Fleetguard, 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.