Granted Patent
Utility
US 4,243,390 · App. 06/107,115
Process for dyeing or printing fibrous material using quaternary polymerized ammonium salts as assistants
Inventors:
Paul Schafer, Hans-Ulrich Berendt, Jaroslav Haase
Patented Case
View Patent ↗
Granted: Jan 6, 1981
Filed: Dec 26, 1979
Inventors
Paul Schafer
Hans-Ulrich Berendt
Jaroslav Haase
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.