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:
Sep. 07, 1976
Filed:
Oct. 15, 1974
Werner Koch, Oberwil, CH;
Sandoz Ltd., Basel, CH;
Abstract
The present invention provides compounds of formula I, ##SPC1## in which, Either R.sub.1 signifies an unsubstituted or substituted (C.sub.1.sub.-4) alkyl radical, R.sub.2 signifies a hydrogen atom or an unsubstituted or substituted (C.sub.1.sub.-4) alkyl radical, Or, R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, form a pyrrolidine, piperidine or morpholine ring, R signifies a group of formula (a) or (b), ##SPC2## In which R.sub.3 signifies a condensed further unsubstituted or substituted pyrimidine, pyridine or benzene ring or a condensed further unsubstituted naphthalene ring, and M signifies a hydrogen ion or a cation equivalent, which compounds are useful as anionic dyes.