Granted Patent
Utility
US 5,264,140 · App. 07/891,131
Antioxidant-dispersant VI improver additive and lubricating oil composition containing same
Inventors:
Munmaya K. Mishra, Isaac D. Rubin
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: Jun 1, 1992
Inventors
Munmaya K. Mishra
Isaac D. Rubin
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.