Granted Patent
Utility
US 5,154,844 · App. 07/588,339
Lubricant additives and their production
Inventor:
Edmund F. Perozzi
Patented Case
View Patent ↗
Granted: Oct 13, 1992
Filed: Sep 26, 1990
Inventor
Edmund F. Perozzi
Assignee (at issue)
Ethyl Petroleum Additives, 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.