Granted Patent
Utility
US 4,764,558 · App. 07/028,363
Alkyl vinyl ether/N-arylmaleimide copolymer containing polymer alloy
Inventor:
Bi Le-Khac
Patented Case
View Patent ↗
Granted: Aug 16, 1988
Filed: Mar 20, 1987
Inventor
Bi Le-Khac
Assignee (at issue)
Arco Chemical Company
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.