Granted Patent
Utility
US 5,414,031 · App. 08/155,043
Intumescent nonhalogenated flame retardant polystyrene composition
Inventor:
Carol L. Knox
Patented Case
View Patent ↗
Granted: May 9, 1995
Filed: Nov 19, 1993
Inventor
Carol L. Knox
Assignee (at issue)
Polymer Products Company, Inc.
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.