Granted Patent
Utility
US 4,617,060 · App. 06/756,580
Silica catalyst supports
Inventor:
John A. Dreibelbis
Patented Case
View Patent ↗
Granted: Oct 14, 1986
Filed: Jul 19, 1985
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.