Granted Patent
Utility
US 4,453,946 · App. 06/370,762
Dyeing assistant and use thereof in dyeing synthetic fibre material
Inventors:
Heinz Abel, Paul Schafer, Hans-Ulrich Berendt
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Apr 22, 1982
Inventors
Heinz Abel
Paul Schafer
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.