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. 24, 1981
Filed:
Oct. 30, 1978
Applicant:
Inventors:
Patricia C Wang, Shanghai, CN;
Robert E Wingard, Jr, Palo Alto, CA (US);
Leonard A Bunes, San Carlos, CA (US);
Assignee:
Dynapol, Palo Alto, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C09B / ;
U.S. Cl.
CPC ...
546 76 ; 260 / ; 426250 ; 426540 ; 426590 ; 525336 ; 525375 ; 525403 ;
Abstract
A process for preparing a family of orange polymeric colorants having a plurality of units of the chromophore ##STR1## is disclosed. R.sub.1 and R.sub.2 are hydrogens, lower alkyls or alkoxies, nitros, halos or sulfonates, R.sub.3 is benzyl, benzyl sulfonate, lower alkyl or alkyl sulfonate, R.sub.4 is hydrogen or lower alkyl. With the disclosed process, the chromophore units, less the R.sub.3 substituent, are bonded to an organic polymer backbone. The R.sub.3 substituent is added thereafter in a separate second step.