Granted Patent
Utility
US 4,661,272 · App. 06/506,733
Thioether diester lubricating oil composition
Inventors:
Edward T. Marquis, Lewis W. Watts, Jr., Ernest L. Yeakey
Patented Case
View Patent ↗
Granted: Apr 28, 1987
Filed: Jun 22, 1983
Inventors
Edward T. Marquis
Lewis W. Watts, Jr.
Ernest L. Yeakey
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.