Granted Patent
Utility
US 4,639,331 · App. 06/603,120
Process for making pulverulent ammonium polyphosphates stable to hydrolysis
Inventors:
Georg Elsner, Horst Staendeke, Gero Heymer
Patented Case
View Patent ↗
Granted: Jan 27, 1987
Filed: Apr 23, 1984
Inventors
Georg Elsner
Horst Staendeke
Gero Heymer
Assignee (at issue)
Hoechst GmbH
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.