Granted Patent
Utility
US 5,116,882 · App. 07/701,279
Process for making copolymers of vinyl aromatic monomers and vinyl phosphonic acid derivatives and foamed articles therefrom
Inventors:
Roger A. Grey, Laurel E. Schock, Diandre Armstead
Patented Case
View Patent ↗
Granted: May 26, 1992
Filed: May 16, 1991
Inventors
Roger A. Grey
Laurel E. Schock
Diandre Armstead
Assignee (at issue)
Arco Chemical Technology, L.P.
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.