Granted Patent
Utility
US 4,452,849 · App. 06/342,880
Phosphonic acid salts, their preparation and their use for fireproofing organic fibre material
Inventors:
Hermann Nachbur, Christian Guth
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Jan 26, 1982
Inventors
Hermann Nachbur
Christian Guth
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.