Granted Patent
Utility
US 4,849,394 · App. 07/079,082
Process for preparing a silica-magnesia cogel catalyst
Inventor:
Andrew Paul Chapple
Patented Case
View Patent ↗
Granted: Jul 18, 1989
Filed: Jul 29, 1987
Inventor
Andrew Paul Chapple
Assignee (at issue)
Unilever Patent Holdings B.V.
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.