The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 03, 1990
Filed:
Jul. 06, 1989
Applicant:
Inventors:
Assignee:
Henkel Kommanditgesellschaft auf Aktien, Duesseldorf, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C14C / ;
U.S. Cl.
CPC ...
8 9427 ; 8 94 / ;
Abstract
The efficiency of chromium utilization in chrome tanning of hides to make leather is greatly improved by performing the preliminary neutralization of the acid tanning liquor in the presence of an aldehydo or keto acid, before conventional subsequent neutralization with an alkali aluminum silicate. Most preferably, a combination of glyoxylic acid and magnesium oxide is used for the preliminary neutralization.