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, 2002
Filed:
Jan. 12, 2001
Applicant:
Inventors:
Manfred Gäng, Bobenheim-Roxheim, DE;
Rudolf Krüger, Weisenheim, DE;
Peter Miederer, Hassloch, DE;
Assignee:
DyStar Textilfarben GmbH & Co. Deutschland KG, Frankfurt, DE;
Primary Examiner:
Int. Cl.
CPC ...
C09B 6/730 ; D06P 1/22 ;
U.S. Cl.
CPC ...
C09B 6/730 ; D06P 1/22 ;
Abstract
Concentrated leuco indigo solutions useful for dyeing cellulosic textile material consist essentially of from 25 to 55% by weight of leuco indigo in the form of the leuco indigo salt, an amount which is essentially stoichiometrically sufficient to convert the leuco indigo into the neutral leuco indigo salt of a mixture of at least two alkali metal hydroxides wherein none of the alkali metal hydroxides accounts for more than 70 mol %, and water.