Granted Patent
Utility
US 4,931,418 · App. 07/117,872
Catalyst comprising potassium and cesium pyrosulfates with vanadium pentoxide and anatase
Inventors:
Leonard A. Cullo, Elliott V. Nagle, Jr., Edward F. Restelli, Jr., Thomas J. Yogan
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Nov 9, 1987
Inventors
Leonard A. Cullo
Elliott V. Nagle, Jr.
Edward F. Restelli, Jr.
Thomas J. Yogan
Assignee (at issue)
Aristech Chemical 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.