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:
Aug. 17, 1976
Filed:
Oct. 29, 1974
Norman James Harper, Newcastel-upon-Tyne, EN;
George Bryan Veitch, Wythall, EN;
Allen & Hanburys Limited, London, EN;
Abstract
Compounds of the general formula I: ##EQU1## in which R.sup.1 - R.sup.4 which may be the same or different represent hydrogen atoms, or C.sub.1.sub.-6 straight or branched chain alkyl, alkenyl or alkynyl group or an alkyl group substituted by a cycloalkyl group, or represents a cycloalkyl, alkoxycarbonyl, aryl, arakyl, acyl (which includes anylsulphonyl) groups in which the alkyl group or the alkyl portion of the aralkyl group may be substituted with one or more hydroxy or esterified hydroxy groups and in which the aryl groups or the aryl portion of the acyl or aralkyl group may be substituted by one or more halogen atoms, alkyl groups, hydroxy groups, alkoxy groups, trifluoromethyl, nitro, amino or dialkylamino groups, and in which R.sup.5 - R.sup.8 which may be the same or different represent hydrogen atoms or alkyl groups except that not all groups may be hydrogen, or R.sup.5 and R.sup.6 or R.sup.7 and R.sup.8 together represent a carbonyl (=O) oxygen and in any of the pairs of groups R.sup.1 /R.sup.2, R.sup.3 /R.sup.4, R.sup.5 /R.sup.6 and R.sup.7 /R.sup.8 may represent a carbocyclic or heterocyclic ring system optionally substituted by lower alkyl or aryl groups, said ring being saturated or unsaturated. These compounds have utility as oral analgesics.