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:
Mar. 01, 1983
Filed:
Jun. 09, 1981
Applicant:
Inventors:
Robert E Wingard, Jr, Mountain View, CA (US);
Steve Y Ng, San Francisco, CA (US);
Sally A Swanson, San Jose, CA (US);
Assignee:
Dynapol, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
8647 ; 8919 ; 525351 ; 525353 ; 528424 ; 5253334 ; 5253336 ;
Abstract
A family of polymeric black colorants is disclosed. The subject colorants are composed of an organic polymer backbone comprised of a plurality of aromatic rings from which depend via azo groups a plurality of chromophore units having the structure ##STR1## wherein M is hydrogen or preferably a cation. These polymeric colorants are water-soluble, and noncrystalline and form dyes and inks that are fast to paper stock.