Granted Patent
Utility
US 5,116,792 · App. 07/573,735
Hydrocarbon conversion catalyst for use in selectively making middle distillates
Inventor:
John W. Ward
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: Aug 28, 1990
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.