Granted Patent
Utility
US 4,737,591 · App. 06/684,822
Catalyst and process for production of cinnamates
Inventor:
Chao-Yang Hsu
Patented Case
View Patent ↗
Granted: Apr 12, 1988
Filed: Dec 21, 1984
Inventor
Chao-Yang Hsu
Assignee (at issue)
Sun Refining and Marketing 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.