Granted Patent
Utility
US 4,514,543 · App. 06/538,243
Methylmethacrylate/phenylmaleimide copolymer and styrene/maleic anhydride copolymer
Inventor:
Barry D. Dean
Patented Case
View Patent ↗
Granted: Apr 30, 1985
Filed: Oct 3, 1983
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.