Granted Patent
Utility
US 4,969,990 · App. 07/401,037
Hydroprocessing with a catalyst having a narrow pore size distribution
Inventor:
Howard D. Simpson
Patented Case
View Patent ↗
Granted: Nov 13, 1990
Filed: Aug 31, 1989
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.