Granted Patent
Utility
US 4,783,435 · App. 07/089,939
Silica catalyst supports
Inventor:
John A. Dreibelbis
Patented Case
View Patent ↗
Granted: Nov 8, 1988
Filed: Aug 25, 1987
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.