Granted Patent
Utility
US 4,902,846 · App. 07/305,716
Synlube process
Inventors:
Thomas J. DiLeo, Matthew J. Lynch, Marshall B. Nelson, Ronny W. Lin
Patented Case
View Patent ↗
Granted: Feb 20, 1990
Filed: Feb 2, 1989
Inventors
Thomas J. DiLeo
Matthew J. Lynch
Marshall B. Nelson
Ronny W. Lin
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.