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:
Sep. 29, 2020
Filed:
May. 17, 2017
Applicant:
Blankophor Gmbh & Co. KG, Ankum, DE;
Inventors:
Marco Hafermann, Bergisch Gladbach, DE;
Bernd Hauschel, Bergisch Gladbach, DE;
Bernhard Hunke, Hennef, DE;
Theo Lansing, Leverkusen, DE;
Michael Kraemer, Kürten, DE;
Robert Peekhaus, Leverkusen, DE;
Assignee:
BLANKOPHOR GMBH & CO. KG, Ankum, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21H 21/30 (2006.01); D21H 21/28 (2006.01); D21H 17/07 (2006.01); D21H 17/09 (2006.01); C09B 23/14 (2006.01); C07D 251/70 (2006.01); D21H 19/44 (2006.01); D21H 23/56 (2006.01);
U.S. Cl.
CPC ...
D21H 21/30 (2013.01); C07D 251/70 (2013.01); C09B 23/148 (2013.01); D21H 17/07 (2013.01); D21H 17/09 (2013.01); D21H 19/44 (2013.01); D21H 21/28 (2013.01); D21H 23/56 (2013.01);
Abstract
Novel fluorescent whitening agents, compositions or mixtures thereof with known fluorescent whitening agents, their preparation, and their use. The novel fluorescent whitening agents (FWAs) contain three structural subunits derived from 4,4'-diamino-2,2′-stilbenedisulfonic acid. The novel compounds and their mixtures with known FWAs show very good effectiveness as fluorescent whitening agents for cellulosic materials, in particular for paper.