Granted Patent
Utility
US 5,891,226 · App. 08/810,552
Salts of phosphonous acids and use thereof as flame retardants in plastics
Inventors:
Hans-Jerg Kleiner, Winfried Budzinsky, Gunther Kirsch
Patented Case
View Patent ↗
Granted: Apr 6, 1999
Filed: Mar 3, 1997
Inventors
Hans-Jerg Kleiner
Winfried Budzinsky
Gunther Kirsch
Assignee (at issue)
Ticona LLC
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.