Granted Patent
Utility
US 4,520,120 · App. 06/590,944
Vanadium passivation in a hydrocarbon catalytic cracking process
Inventors:
Bruce R. Mitchell, Roger F. Vogel
Patented Case
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Granted: May 28, 1985
Filed: Mar 19, 1984
Inventors
Bruce R. Mitchell
Roger F. Vogel
Assignee (at issue)
Gulf Research & Development Company
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.