Granted Patent
Utility
US 5,281,747 · App. 07/873,488
Substituted aminoalkylphosphinic acids
Inventors:
Roger Graham Hall, Ludwig Maier, Wolfgang Frostl
Patented Case
View Patent ↗
Granted: Jan 25, 1994
Filed: Apr 22, 1992
Inventors
Roger Graham Hall
Ludwig Maier
Wolfgang Frostl
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.