Granted Patent
Utility
US 4,906,793 · App. 07/286,909
Silica-titania hydrocarbon conversion catalyst
Inventors:
Leonard A. Cullo, Francis J. Shiring, III
Patented Case
View Patent ↗
Granted: Mar 6, 1990
Filed: Nov 17, 1988
Inventors
Leonard A. Cullo
Francis J. Shiring, III
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.