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. 07, 1995
Filed:
Apr. 23, 1993
Applicant:
Inventor:
Davor Bedekovic, Biel-Benken, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548458 ; 5483647 ; 548440 ; 548466 ; 548471 ;
Abstract
The present invention relates to chromogenic methylenepyrrolines and processes and intermediates for their preparation and to their use. The chromogenic methylenepyrroline compounds according to the invention have the formula (I) defined in claim 1. These colour formers are suitable in particular for thermographic recording processes and produce intensive red, violet, blue or brown colourations. They are distinguished by the fact that they do not require any conventional electron-withdrawing acid colour developer.