Granted Patent
Utility
US 4,869,803 · App. 07/197,597
Hydrocarbon conversion process for selectively making middle distillates
Inventor:
John W. Ward
Patented Case
View Patent ↗
Granted: Sep 26, 1989
Filed: May 23, 1988
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.