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:
May. 17, 1983
Filed:
Feb. 19, 1982
Applicant:
Inventors:
Hans-Juergen Degen, Lorsch, DE;
Wolf Guender, Neustadt, DE;
Guenter Frey, Dannstadt-Schauernheim, DE;
Werner Streit, Bobenheim, DE;
Rolf Fikentscher, Ludwigshafen, DE;
Klaus Wulz, Lambsheim, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
D21D / ; D06P / ; D21H / ; D21H / ;
U.S. Cl.
CPC ...
8551 ; 8554 ; 8919 ; 162162 ;
Abstract
A process for coloring paper with an acid dye and/or direct dye in an aqueous medium in the presence of a water-soluble reaction product of an alkylating agent, possessing an aromatic substituent, with a cationic polyelectrolyte. The process gives papers with high color strength and substantially avoids cylinder twosidedness of the coloration.