Granted Patent
Utility
US 4,452,602 · App. 06/360,025
Process for dyeing leather with mixtures of dyes
Inventors:
Alois Puntener, Josef Koller, Fabio Beffa
Patented Case
View Patent ↗
Granted: Jun 5, 1984
Filed: Mar 19, 1982
Inventors
Alois Puntener
Josef Koller
Fabio Beffa
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.