Abstract: The invention relates to a composition intended for the treatment of skin aging, containing, in a physiologically acceptable medium, at least one salicylic acid derivative corresponding to the formula: ##STR1## in which: R represents a saturated aliphatic chain or an unsaturated chain bearing one or more conjugated or unconjugated double bonds, it being possible for the chains to be substituted with one or more halogen atoms as well as with trifluoromethyl groups, with one or more hydroxyl groups in free form or a form esterified by an acid, or alternatively with a carboxyl group, free or esterified by a lower alcohol; andR' represents a hydroxyl group or an ester group of formula: ##STR2## where R.sub.1 is a saturated or unsaturated aliphatic group.

Abstract: Quaternary ammonium retinoate, characterized in that it corresponds to the formula: ##STR1## in which: X-- denotes either an all-trans-retinoate of formula (I): ##STR2## or a 13-cis= retinoate of formula: ##STR3## (i) R.sub.1, R.sub.2 and R.sub.3, which may be identical or different, denote a saturated C.sub.1 -C.sub.4 linear alkyl group capable of bearing one or more hydroxyl group(s) at the end of the chain or in the chain;R.sub.4 denotes a C.sub.12 -C.sub.18 linear alkenyl or alkyl group;(ii) R.sub.3 denotes a group: ##STR4## in which n equals 0 or 1, R.sub.5 denotes a hydrogen atom, a hydroxyl, a halogen atom, a C.sub.1 -C.sub.18 -hydroxyl alkyl or alkyl group or a C.sub.2 to C.sub.18 acyl group;R.sub.1, R.sub.2 and R.sub.4 having the same meanings as those under (i);(iii) R.sub.1 and R.sub.2 can form an aliphatic heterocycle optionally containing an oxygen atom, another nitrogen atom or a sulphur atom;R.sub.3 and R.sub.4 having the same meanings as those under (i) and (ii).

Abstract: Topical compositions intended for skin treatment and based on salicylic acid derivatives.The invention relates to topical compositions with a keratolytic and/or comedolytic effect, containing, in a carrier which is suitable for application to skin, at least one compound corresponding to the formula I: ##STR1## in which R denotes a linear, branched or cyclized saturated aliphatic chain containing from 3 to 11 carbon atoms, an unsaturated chain containing from 3 to 17 carbon atoms and containing one or more conjugated or unconjugated double bonds, these various substituents being optionally substituted by one or more halogen atoms, by one or more trifluoromethyl groups, by one or more hydroxyl groups in free form or esterified with an acid containing from 1 to 6 carbon atoms or by a carbonyl group which is free or esterified with a lower alcohol containing from 1 to 6 carbon atoms,R' denotes a hydroxyl group or an ester group of formula: ##STR2## where R.sub.

Abstract: A bayonet drive coupling comprises a barrel and end fitting to be connected by a first bayonet coupling and a spindle and sleeve to be connected by a second bayonet coupling. The second bayonet coupling comprises a slot having a straight entry portion and an oblique second slot portion to receive a pin of the spindle, whereby axial movement of the sleeve is actuated as the pin moves along the second slot portion.