Granted Patent
Utility
US 4,263,197 · App. 06/079,292
Process for dyeing linear polyamides in the melt
Inventors:
Paul Lienhard, Abul Iqbal, Heinz Peter
Patented Case
View Patent ↗
Granted: Apr 21, 1981
Filed: Sep 27, 1979
Inventors
Paul Lienhard
Abul Iqbal
Heinz Peter
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.