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:
Nov. 08, 2016
Filed:
Jul. 17, 2014
Applicant:
3v Sigma S.p.a., Milan, IT;
Inventors:
Ferruccio Berte', Bergamo, IT;
Patrick Alborghetti, Bergamo, IT;
Assignee:
3V SIGMA S.P.A., Milan, IT;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C09K 13/06 (2006.01); C07D 403/12 (2006.01); C07C 309/15 (2006.01); C07C 303/22 (2006.01); C07C 303/32 (2006.01); D21H 21/30 (2006.01); D06L 3/12 (2006.01);
U.S. Cl.
CPC ...
C07D 403/12 (2013.01); C07C 303/22 (2013.01); C07C 303/32 (2013.01); C07C 309/15 (2013.01); D06L 3/1214 (2013.01); D21H 21/30 (2013.01);
Abstract
The present invention discloses compounds of 4,4'-diaminostilbene-2,2′-disulphonic acid which are useful as optical brighteners to bleach fibers, cellulose and in particular paper and cardboard.