Granted Patent
Utility
US 4,992,183 · App. 07/394,338
Multigrade hydrogenated decene-1 oligomer engine oils
Inventors:
Bruce J. Beimesch, James E. Davis
Patented Case
View Patent ↗
Granted: Feb 12, 1991
Filed: Aug 15, 1989
Inventors
Bruce J. Beimesch
James E. Davis
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.