Granted Patent
Utility
US 4,615,837 · App. 06/321,850
Propylene oxide polyadducts containing carboxyl groups and their salts useful as dyeing assistants for dyeing wool fibers
Inventors:
Heinz Abel, Paul Schafer
Patented Case
View Patent ↗
Granted: Oct 7, 1986
Filed: Nov 16, 1981
Inventors
Heinz Abel
Paul Schafer
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.