Granted Patent
Utility
US 5,350,501 · App. 07/663,242
Hydrocracking catalyst and process
Inventor:
John J. B. Ward
Patented Case
View Patent ↗
Granted: Sep 27, 1994
Filed: Feb 28, 1991
Inventor
John J. B. 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.