Granted Patent
Utility
US 4,453,942 · App. 06/448,571
Use of 1:2 cobalt complex dyes for dyeing leather or furs
Inventor:
Alois Puntener
Patented Case
View Patent ↗
Granted: Jun 12, 1984
Filed: Dec 10, 1982
Inventor
Alois Puntener
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.