Granted Patent
Utility
US 5,772,873 · App. 08/893,842
Slow release coolant filter
Inventors:
R. Douglas Hudgens, Charles L. Matheson
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Jul 11, 1997
Inventors
R. Douglas Hudgens
Charles L. Matheson
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.