Granted Patent
Utility
US 4,359,555 · App. 06/160,529
Salts formed from formamidines with polymers containing sulfonic acid groups
Inventors:
Christian d'Hondt, Dieter Lohmann, Ernst Neuenschwander
Patented Case
View Patent ↗
Granted: Nov 16, 1982
Filed: Jun 18, 1980
Inventors
Christian d'Hondt
Dieter Lohmann
Ernst Neuenschwander
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.