Granted Patent
Utility
US 6,402,938 · App. 09/576,847
Vaporization of used motor oil with non-hydrogenating recycle vapor
Inventors:
Howard F. Moore, Arthur G. Shaffer, Jr.
Patented Case
View Patent ↗
Granted: Jun 11, 2002
Filed: May 23, 2000
Inventors
Howard F. Moore
Arthur G. Shaffer, Jr.
Assignee (at issue)
Marathon Ashland Petroleum LLC
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.