Granted Patent
Utility
US 4,422,959 · App. 06/376,080
Hydrocracking process and catalyst
Inventors:
Randy J. Lawson, Russell W. Johnson, Lee Hilfman
Patented Case
View Patent ↗
Granted: Dec 27, 1983
Filed: May 7, 1982
Inventors
Randy J. Lawson
Russell W. Johnson
Lee Hilfman
Assignee (at issue)
UOP LLC
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.