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:
May. 25, 1976
Filed:
Feb. 20, 1974
Applicant:
Inventor:
Dennis Scott Donald, Mendenhall, PA (US);
Assignee:
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
2602 / ; 25230125 ; 2602 / ; 2602 / ; 2602 / ;
Abstract
Diimidazopyrazines of the formula: ##SPC1## Wherein R.sup.1 and R.sup.2 are selected from the group consisting of lower alkyl and aryl of 6 to 12 carbons which may be optionally substituted are described. These compounds are useful as brightening agents. They are prepared from tetracarboxamidopyrazines of the formula: ##SPC2## Wherein the R's are as specified above for R.sup.1 and R.sup.2.