Granted Patent
Utility
US 4,288,489 · App. 06/008,217
Process for flameproofing organic fibrous material with phosphonic acid salts
Inventors:
Hermann Nachbur, Peter Rohringer
Patented Case
View Patent ↗
Granted: Sep 8, 1981
Filed: Jan 31, 1979
Inventors
Hermann Nachbur
Peter Rohringer
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.