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:
May. 18, 1976
Filed:
Apr. 01, 1974
Applicant:
Inventors:
Kurt Hofer, Munchenstein, CH;
Guenther Tscheulin, Rieben, CH;
Assignee:
Sandoz Ltd., Basel, CH;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ; C07D / ; C07D / ;
U.S. Cl.
CPC ...
2602 / ; 260 / ; 2602401 ; 2602 / ;
Abstract
The present invention concerns novel aromatic heterocyclic hydrazide derivatives of the formula: ##SPC1## Wherein A is a radical ##SPC2## Wherein R.sub.1 is tertiary alkyl and R.sub.2 and R.sub.3 are hydrogen or substituents, e.g. alkyl, R.sub.4 is a group -X-R.sub.14.sub.' wherein X is a bridging function, e.g. O, and R.sub.14 is a substituent, e.g. alkyl, a heterocyclic group --N Z wherein Z, with the nitrogen atom, forms a heterocyclic ring or a radical -NH-A, wherein A is as defined above, R.sub.5 has inter alia one of the significances of R.sub.4 and Y is -N= or -CH=, which are useful antioxidants, e.g. for stabilizing plastics material.