Granted Patent
Utility
US 4,601,815 · App. 06/686,859
Passivation of FCC catalysts
Inventors:
David R. Forester, Raymon Barlow
Patented Case
View Patent ↗
Granted: Jul 22, 1986
Filed: Dec 27, 1984
Inventors
David R. Forester
Raymon Barlow
Assignee (at issue)
Betz Laboratories, Inc.
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.