Granted Patent
Utility
US 4,320,032 · App. 06/184,588
Catalyst for hydrogenation of aromatic dinitriles
Inventor:
Howard P. Angstadt
Patented Case
View Patent ↗
Granted: Mar 16, 1982
Filed: Sep 5, 1980
Inventor
Howard P. Angstadt
Assignee (at issue)
SUNTEC CO., LTD.
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.