Granted Patent
Utility
US 5,133,779 · App. 07/771,087
Cationic reaction products of basic carbamides and epihalohydrins: quaternary ammonium salts as dyeing aids for cellulose
Inventors:
Rosemarie Topfl, Jorg Binz
Patented Case
View Patent ↗
Granted: Jul 28, 1992
Filed: Oct 2, 1991
Inventors
Rosemarie Topfl
Jorg Binz
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.