Abstract: The invention relates to a protection device which defines a through hole (21) for the passage of a fluid which may be under overpressure conditions. In addition, the inventive device comprises: a stop plug (26) which can move between an open position and a position in which a first section of the hole (21) is sealed; a stop valve (28) which can move between an open position and a position in which a second section of the hole (21) is sealed; and means (22, 23, 27) for triggering both the movement of the stop plug (26) and the movement of the valve (28) from the open position to the sealing position in response to an overpressure (P2) in the hole (21). The invention is particularly suitable for self-contained equipment used to supply electrical power by means of a fuel cell.

Abstract: The invention relates to a protection device which defines a through hole (21) for the passage of a fluid which may be under overpressure conditions. In addition, the inventive device comprises: a stop plug (26) which can move between an open position and a position in which a first section of the hole (21) is sealed; a stop valve (28) which can move between an open position and a position in which a second section of the hole (21) is sealed; and means (22, 23, 27) for triggering both the movement of the stop plug (26) and the movement of the valve (28) from the open position to the sealing position in response to an overpressure (P2) in the hole (21). The invention is particularly suitable for self-contained equipment used to supply electrical power by means of a fuel cell.

Abstract: A novel process for the resolution of D,L-cis and D,L-trans 2,2-dimethyl-3-(2,2 -dihalovinyl)-cyclopropane-1-carboxylic acids of the formula ##STR1## wherein X is selected from the group consisting of fluorine, chlorine and bromine comprising salifying the said acid with an optically active base selected from the group consisting of D-ephedrine, L-ephedrine, D-N-methyl-ephedrine, L-N-methylephedrine, D-pseudo-ephedrine and L-pseudo-ephedrine to form the corresponding salt, recovering the said salt and subjecting the latter to acid hydrolysis to obtain the corresponding resolved acid which are intermediates for the synthesis of esters having a remarkable insecticidal activity.

Abstract: Novel synergistic insecticidal compositions comprising as the active ingredient an insecticidally effective amount of a synergistic mixture of 90 to 60% by weight of (S) 1-oxo-2-allyl-3-methyl-cyclopent-2-en-4-yl d trans chrysanthemate and 10 to 40% by weight of (R) 1-oxo-2-allyl-3-methyl-cyclopent-2-en-4-yl d trans chrysanthemate and to a novel method of combatting arthropodes.

Abstract: Novel process for the preparation of 4-chloroquinolines of the formula ##STR1## wherein X is in the 5,6,7 or 8-position and is selected from the group consisting of hydrogen, methyl, halogen, CF.sub.3 --, CF.sub.3 O-- and CF.sub.3 S-- by reacting a compound of the formula ##STR2## or a functional derivative thereof with a chlorination agent in the presence of an oxidation agent and to a novel intermediate.

Abstract: A novel process for the purification of 3.alpha.,7.alpha.-dihydroxy-(5.beta.)-cholanic acid comprising crystallizing the said product from methylene chloride.

Abstract: A process for the resolution of DL-cis chrysanthemic acid or DL-trans chrysanthemic acid with L or D N-methyl-ephedrine to form the corresponding salt and acid hydrolyzing the same which resolved acids are intermediates for preparing esters having a remarkable insecticidal activity.

Abstract: A novel process for the preparation of racemic allethrolone of the (R,S) configuration comprising heating optically active allethrolone of the (R) configuration or of the (S) configuration or a mixture of the (R) and (S) configurations in non-equimolecular proportions with formic acid to form the formate of racemic allethrolone of (R,S) configuration and hydrolyzing the latter in the presence of an acid or base to obtain racemic (R,S) allethrolone.