Granted Patent
Utility
US 5,043,523 · App. 07/624,530
Al.sub.2 O.sub.3 alkene isomerization process and catalyst
Inventor:
Hsu-Hui Hsing
Patented Case
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Granted: Aug 27, 1991
Filed: Dec 7, 1990
Inventor
Hsu-Hui Hsing
Assignee (at issue)
Texas Petrochemicals LLC
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.