Granted Patent
Utility
US 4,273,663 · App. 06/093,481
Quaternary ammonium diester salt composition and lubricating oil containing same
Inventors:
Kenneth G. Hammond, Harry Chafetz
Patented Case
View Patent ↗
Granted: Jun 16, 1981
Filed: Nov 13, 1979
Inventors
Kenneth G. Hammond
Harry Chafetz
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.