Granted Patent
Utility
US 4,996,385 · App. 07/451,833
Use of silica-titania hydrocarbon conversion catalyst in hydrocarbon conversion processes
Inventors:
Leonard A. Cullo, Francis J. Shiring, III
Patented Case
View Patent ↗
Granted: Feb 26, 1991
Filed: Dec 18, 1989
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.