Granted Patent
Utility
US 4,772,738 · App. 06/940,836
Substituted propane-phosphonuous acid compounds
Inventors:
John G. Dingwall, Josef Ehrenfreund, Roger Graham Hall, James Jack
Patented Case
View Patent ↗
Granted: Sep 20, 1988
Filed: Dec 12, 1986
Inventors
John G. Dingwall
Josef Ehrenfreund
Roger Graham Hall
James Jack
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.