Granted Patent
Utility
US 4,248,719 · App. 06/069,450
Quaternary ammonium salts and lubricating oil containing said salts as dispersants
Inventors:
Harry Chafetz, Gary D. Lee
Patented Case
View Patent ↗
Granted: Feb 3, 1981
Filed: Aug 24, 1979
Inventors
Harry Chafetz
Gary D. Lee
Assignee (at issue)
Texaco 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.