Granted Patent
Utility
US 6,767,871 · App. 10/225,040
Diesel engine lubricants
Inventors:
Mark T. Devlin, Charles A. Passut, Carl K. Esche, Jr., John T. Loper
Patented Case
View Patent ↗
Granted: Jul 27, 2004
Filed: Aug 21, 2002
Inventors
Mark T. Devlin
Charles A. Passut
Carl K. Esche, Jr.
John T. Loper
Assignee (at issue)
Ethyl 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.