Granted Patent
Utility
US 4,656,200 · App. 06/691,311
Phosphonic acid salts as flame retardants for polyurethanes and polyisocyanurates
Inventors:
Brian G. Clubley, Richard J. Dellar, David Buszard, Norman Richardson
Patented Case
View Patent ↗
Granted: Apr 7, 1987
Filed: Jan 14, 1985
Inventors
Brian G. Clubley
Richard J. Dellar
David Buszard
Norman Richardson
Assignee (at issue)
Ciba-Geigy
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.