Patent · US Expired

Process for dyeing leather with mixtures of dyes

US4452602A · kind A · utility

7Cited by

2References

23Claims

0Family size

Inventors

Alois Puntener · Rheinfelden, CH
Josef Koller · Erkrath, DE
Fabio Beffa · Riehen, CH

Key dates

Filing date	Mar 19, 1982
Grant date	Jun 5, 1984
Priority date	—
Expiry date	Mar 19, 2002

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S534/01
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A mixture of at least three selected 1:2 chromium or 1:2 cobalt complex dyes of different colors and belonging to the azo or azomethine series is used for dyeing leather and furs. The mixtures of dyes make it possible for the first time to dye leather by the trichromatic process.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.