Granted Patent
Utility
US 4,937,394 · App. 07/228,123
Silica catalyst supports for hydration of ethylene to ethanol
Inventor:
John A. Dreibelbis
Patented Case
View Patent ↗
Granted: Jun 26, 1990
Filed: Aug 4, 1988
Inventor
John A. Dreibelbis
Assignee (at issue)
MALLINCKRODT 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.