Granted Patent
Utility
US 5,340,957 · App. 07/994,535
Hydrocracking process using a reactivated catalyst
Inventor:
Danford E. Clark
Patented Case
View Patent ↗
Granted: Aug 23, 1994
Filed: Dec 21, 1992
Inventor
Danford E. Clark
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.