Granted Patent
Utility
US 4,228,036 · App. 05/049,358
Alumina-aluminum phosphate-silica-zeolite catalyst
Inventors:
Harold E. Swift, John J. Stanulonis, Elizabeth H. Reynolds
Patented Case
View Patent ↗
Granted: Oct 14, 1980
Filed: Jun 18, 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.