Granted Patent
Utility
US 4,247,476 · App. 05/911,725
Polymeric quaternary ammonium salts containing specific cationic recurring units
Inventors:
Jaroslav Haase, Ulrich Horn, Hans-Ulrich Berendt
Patented Case
View Patent ↗
Granted: Jan 27, 1981
Filed: Jun 1, 1978
Inventors
Jaroslav Haase
Ulrich Horn
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.