Granted Patent
Utility
US 4,663,390 · App. 06/718,594
Methylmethacrylate/phenylmaleimide copolymer and styrene/maleic anhydride copolymer containing polymer alloys
Inventor:
Barry D. Dean
Patented Case
View Patent ↗
Granted: May 5, 1987
Filed: Apr 1, 1985
Inventor
Barry D. Dean
Assignee (at issue)
Atlantic Richfield 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.