Granted Patent
Utility
US 4,913,801 · App. 07/208,202
Passivation of FCC catalysts
Inventor:
David R. Forester
Patented Case
View Patent ↗
Granted: Apr 3, 1990
Filed: Jun 17, 1988
Inventor
David R. Forester
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.