Granted Patent
Utility
US 4,507,125 · App. 06/545,554
Use of 1:2 chrome complex dyes for dyeing leather and furs
Inventors:
Alois Puntener, Josef Koller
Patented Case
View Patent ↗
Granted: Mar 26, 1985
Filed: Oct 26, 1983
Inventors
Alois Puntener
Josef Koller
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.