Granted Patent
Utility
US 4,335,037 · App. 06/247,689
Blend of styrene-maleic anhydride and high impact polystyrene
Inventors:
Frank E. Lordi, Peter Francis
Patented Case
View Patent ↗
Granted: Jun 15, 1982
Filed: Mar 26, 1981
Inventors
Frank E. Lordi
Peter Francis
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.