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. 21, 1992
Filed:
Jun. 06, 1991
Applicant:
Inventors:
Erwin Hahn, Heidelberg, DE;
Georg Henning, Ludwigshafen, DE;
Manfred Mielke, Heidelberg, DE;
Hans-Juergen Degen, Lorsch, DE;
Sigberg Pfohl, Speyer, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
D21H / ; D21H / ; D21H / ; D21H / ;
U.S. Cl.
CPC ...
162162 ; 1621684 ; 1621685 ; 1621683 ; 1621682 ; 162183 ;
Abstract
The wet-end coloring of paper with pigments and fixers is carried out by a process in which the pigment and fixer are added simultaneously to the paper pulp to be colored, and the fixer used is a cationic fixer, in an amount of from 0.01 to 3% by weight, based on the dry paper pulp to be colored.