Granted Patent
Utility
US 4,222,896 · App. 06/057,658
Magnesia-alumina-aluminum phosphate-zeolite catalyst
Inventors:
Harold E. Swift, John J. Stanulonis, Elizabeth H. Reynolds
Patented Case
View Patent ↗
Granted: Sep 16, 1980
Filed: Jul 16, 1979
Inventors
Harold E. Swift
John J. Stanulonis
Elizabeth H. Reynolds
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.