Granted Patent
Utility
US 4,994,425 · App. 07/322,569
Catalyst base
Inventor:
Andrew Paul Chapple
Patented Case
View Patent ↗
Granted: Feb 19, 1991
Filed: Mar 13, 1989
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.