Granted Patent
Utility
US 4,879,053 · App. 07/217,540
Process for preparing overbased calcium sulfonates
Inventors:
Leonard A. Matthews, William J. Powers, III, Henry M. Przybyla, Joanne R. Whittle, Jerry C. Perciful
Patented Case
View Patent ↗
Granted: Nov 7, 1989
Filed: Jul 11, 1988
Inventors
Leonard A. Matthews
William J. Powers, III
Henry M. Przybyla
Joanne R. Whittle
Jerry C. Perciful
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.