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:
Mar. 02, 1976
Filed:
Aug. 27, 1973
Werner Koch, Oberwil, CH;
Sandoz Ltd., (Sandoz AG), Basel, CH;
Abstract
The invention relates to compounds of formula I, ##SPC1## in which either, each of R.sub.1 and R.sub.2, which may be the same or different, signifies a hydrogen atom or an unsubstituted or substituted (C.sub.1.sub.-7) alkyl or (C.sub.2.sub.-7) alkenyl radical, with the proviso that that when one of R.sub.1 and R.sub.2 signifies a hydrogen atom, the other has a significance other than hydrogen, or R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, from a five or six-membered substituted or unsubstituted heterocyclic ring system, R.sub.3 signifies a hydrogen atom or an unsubsstituted (C.sub.1.sub.-7) alkyl radical, R.sub.4 signifies the atoms necessary to complete an aromatic carbocyclic or heterocyclic ring system, which ring system in addition to bearing up to two sulphonic groups is further unsubstituted or further substituted, M is hydrogen or alkali metal, n is 1 or 2, and the ring A is further unsubstituted or further substituted, which compounds are useful as water-soluble fluorescent dyes.