Granted Patent
Utility
US 4,743,355 · App. 06/869,552
Process for producing a high quality lube oil stock
Inventor:
John W. Ward
Patented Case
View Patent ↗
Granted: May 10, 1988
Filed: Jun 2, 1986
Inventor
John W. Ward
Assignee (at issue)
Union Oil Company of California
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.