Granted Patent
Utility
US 4,238,572 · App. 06/095,015
Foamable ABS polyblend composition
Inventor:
Richard L. Hoffman
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Nov 16, 1979
Inventor
Richard L. Hoffman
Assignee (at issue)
Monsanto 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.