Granted Patent
Utility
US 5,139,688 · App. 07/563,598
Dispersant and antioxidant additive and lubricating oil composition containing same
Inventor:
Theodore E. Nalesnik
Patented Case
View Patent ↗
Granted: Aug 18, 1992
Filed: Aug 6, 1990
Inventor
Theodore E. Nalesnik
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.