Granted Patent
Utility
US 5,256,324 · App. 07/766,127
Modified succinimide or succinamide dispersants and their production
Inventor:
Andrew G. Papay
Patented Case
View Patent ↗
Granted: Oct 26, 1993
Filed: Sep 27, 1991
Inventor
Andrew G. Papay
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.