Granted Patent
Utility
US 4,322,372 · App. 06/167,578
Condensation products containing sulphonic acid groups
Inventors:
Albert Wurmli, Hans-Ulrich Berendt
Patented Case
View Patent ↗
Granted: Mar 30, 1982
Filed: Jul 11, 1980
Inventors
Albert Wurmli
Hans-Ulrich Berendt
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.