Granted Patent
Utility
US 4,491,647 · App. 06/557,975
Polymer composition containing polycarbonate and a copolymer of methylmethacrylate with N-phenylmaleimide
Inventor:
Barry D. Dean
Patented Case
View Patent ↗
Granted: Jan 1, 1985
Filed: Dec 5, 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.