Granted Patent
Utility
US 4,606,834 · App. 06/774,519
Lubricating oil containing VII pour depressant
Inventors:
William P. Hart, Donald L. Mays
Patented Case
View Patent ↗
Granted: Aug 19, 1986
Filed: Sep 10, 1985
Inventors
William P. Hart
Donald L. Mays
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.