Granted Patent
Utility
US 5,772,881 · App. 08/746,430
Non-metallic spin-on filter
Inventors:
John W. Stockhowe, Larry Dean Michels
Patented Case
View Patent ↗
Granted: Jun 30, 1998
Filed: Nov 8, 1996
Inventors
John W. Stockhowe
Larry Dean Michels
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.