Granted Patent
Utility
US 4,886,582 · App. 07/213,079
Resid hydroprocessing catalyst and method of preparation
Inventor:
Howard D. Simpson
Patented Case
View Patent ↗
Granted: Dec 12, 1989
Filed: Jun 29, 1988
Inventor
Howard D. Simpson
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.