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:
Aug. 06, 1991
Filed:
Aug. 21, 1989
Applicant:
Inventors:
Hubert Kruse, Kelkheim, DE;
Ulrich Buhler, Alzenau, DE;
Konrad Opitz, Liederbach, DE;
Willi Steckelberg, Hofheim, DE;
Assignee:
Cassella AG, Frankfurt am Main, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09B / ; C09B / ; D06P / ; D06P / ;
U.S. Cl.
CPC ...
534575 ; 534855 ; 534887 ;
Abstract
The .beta.-modification, which is stable under dyeing conditions, of the dyestuff of the formula ##STR1## is prepared by heating the .alpha.-modification, which is unstable under dyeing conditions, at temperatures of 60.degree. to 180.degree. C. and the .beta.-modification is useful in printing and dyeing fiber materials of cellulose esters, synthetic linear polyesters or mixed fabrics of the polyester fiber material with wool or viscose staple.