Granted Patent
Utility
US 4,427,411 · App. 06/360,032
Use of 1:2 chromium or cobalt complex dyes for dyeing leather or furs
Inventor:
Alois Puntener
Patented Case
View Patent ↗
Granted: Jan 24, 1984
Filed: Mar 19, 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.