Granted Patent
Utility
US 6,478,953 · App. 09/727,086
Oil filter and dehydrator
Inventors:
Michael R. Spearman, David Kolstad, John H. Burban, Craig J. Cuta, Mathews Thundyil, Majid Zia
Patented Case
View Patent ↗
Granted: Nov 12, 2002
Filed: Nov 30, 2000
Inventors
Michael R. Spearman
David Kolstad
John H. Burban
Craig J. Cuta
Mathews Thundyil
Majid Zia
Assignee (at issue)
Porous Media Corporation
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.