Granted Patent
Utility
US 6,585,887 · App. 09/820,267
End cap relief valve mechanism for a filter
Inventors:
Larry Dean Michels, John D. Gaither, Richard Schwarzlose
Patented Case
View Patent ↗
Granted: Jul 1, 2003
Filed: Mar 28, 2001
Inventors
Larry Dean Michels
John D. Gaither
Richard Schwarzlose
Assignee (at issue)
CHAMPION LABORATORIES, 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.