Granted Patent
Utility
US 5,330,664 · App. 07/939,195
Neutral and low overbased alkylphenoxy sulfonate additive compositions derived from alkylphenols prepared by reacting an olefin or an alcohol with phenol in the presence of an acidic alkylation catalyst
Inventors:
Robert H. Wollenberg, Richard J. Nelson, John H. McDonald, III, Susanne G. Ruelas, Curtis B. Campbell, Kathryn E. Matera
Patented Case
View Patent ↗
Granted: Jul 19, 1994
Filed: Sep 2, 1992
Inventors
Robert H. Wollenberg
Richard J. Nelson
John H. McDonald, III
Susanne G. Ruelas
Curtis B. Campbell
Kathryn E. Matera
Assignee (at issue)
Chevron Research and Technology Company
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.