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, 1978
Filed:
Jan. 23, 1975
Ciba-Geigy Corporation, Ardsley, NY (US);
Abstract
Indolyl methylene leuco dyestuffs of the formula ##STR1## wherein X.sub.1 and X.sub.2 independently of the other, represent alkyl with 2 to 12 carbon atoms, alkenyl with at most 12 carbon atoms or phenylalkyl with 1 to 4 carbon atoms in the alkyl part, Y.sub.1 and Y.sub.2 independently of the other, represent hydrogen, alkyl with 1 to 12 carbon atoms or phenyl, Z represents alkyl with 1 to 12 carbon atoms, alkenyl with at most 12 carbon atoms, aryl, aralkyl or a heterocyclic residue and the rings A and B may be further substituted by cyano, nitro, halogen, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or acyl with 1 to 8 carbon atoms, said methylene compounds are particularly useful as slow developing color formers in pressure-sensitive recording material and exhibit good light and air stability.