Patent · US Expired

Processing for tanning leather

US4822372A · kind A · utility

3Cited by

4References

8Claims

0Family size

Assignee

Cassella Aktiengesellschaft · DE

Inventors

Frank Forster · Oberkirch, DE
Karlfried Keller · Frankfurt am Main, DE
Hermann Becker · Trier, DE
Werner Lotz · Niedernhausen, DE

Key dates

Filing date	Sep 11, 1987
Grant date	Apr 18, 1989
Priority date	—
Expiry date	Sep 11, 2007

Classification

Technology area (CPC H)Electricity
CPC primaryH05K3/3463
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An improved process for tanning leather by treating animal skins with a water-soluble melamine-formaldehyde resin in the presence of an acid catalyst towards the end is improved by using a melamine-formaldehyde resin which is at least partially etherified with a glycol ether, alkyl glycol ether, or both.

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