Granted Patent
Utility
US 4,325,847 · App. 06/160,851
Use of additional alumina for extra zeolite stability in FCC catalyst
Inventors:
John Lim, Adrian P. Humphries, Dennis Stamires
Patented Case
View Patent ↗
Granted: Apr 20, 1982
Filed: Jun 19, 1980
Inventors
John Lim
Adrian P. Humphries
Dennis Stamires
Assignee (at issue)
Filtrol Corporation
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.