Granted Patent
Utility
US 4,448,974 · App. 06/361,519
Polyalkylene succinimide lubricant additives
Inventors:
Joseph P. O'Brien, Andrew G. Papay
Patented Case
View Patent ↗
Granted: May 15, 1984
Filed: Mar 24, 1982
Inventors
Joseph P. O'Brien
Andrew G. Papay
Assignee (at issue)
Edwin Cooper, Inc.
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.