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:
Nov. 10, 1987
Filed:
Dec. 16, 1985
Applicant:
Inventors:
Davor Bedekovic, Therwil, CH;
Ian J Fletcher, Magden, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B41M / ; B41M / ; B41M / ;
U.S. Cl.
CPC ...
503220 ; 427151 ; 503223 ; 503226 ;
Abstract
The invention relates to chromogenic 3,3-bisindolyl-4-azaphthalides of the general formula ##STR1## wherein Y.sub.1 is hydrogen, C.sub.1 -C.sub.12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or is C.sub.1 -C.sub.12 acyl, benzyl or benzyl substituted halogen, nitro, lower alkyl or lower alkoxy,