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:
Feb. 23, 1993
Filed:
Jan. 07, 1992
Applicant:
Inventors:
Assignee:
Imperial Chemical Industries PLC, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C09B / ; D06P / ;
U.S. Cl.
CPC ...
549299 ; 544148 ; 546197 ; 562441 ; 562457 ; 562458 ; 562491 ; 534725 ; 549 45 ; 549 47 ;
Abstract
A process for the preparation of a polycyclic dye of the Formula (1): ##STR1## by reacting a substituted acetic acid of the Formula (2): ##STR2## with a compound of the Formula (3): ##STR3## and oxidation of the intermediate leuco compound to dehydrogenate the peripheral heterocyclic rings wherein