Granted Patent
Utility
US 4,527,994 · App. 06/630,466
Process for mass-coloring nylon with 1:2 chromium complex azo dye
Inventors:
Paul Lienhard, Werner Saar
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Jul 12, 1984
Inventors
Paul Lienhard
Werner Saar
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.