The active substance of the positive electrode of an accumulator cell consists of crystalline and polycrystalline lead superoxide in which the lead has its maximum valency of 4. The polycrystalline lead superoxide is an aggregation of individual crystalline substances which are in different growth and development phases. The active substance is located, as an adhering and permanent coating layer, ...

Splicing assembly, including a splicing device having a pneumatic thread splicer for joining an upper thread to a lower thread and a testing device for monitoring the tensile strength of the splice.

A long, thin annular belt-like channel is designed for use in sedimentation field flow fractionation. This channel, which is the rotor of a centrifuge, is designed to maintain its thickness dimension constant and yet facilitate its manufacture and cleaning by forming the rotor of a double mating ring in which the inner ring is split. This permits the inner ring to conform to the outer load carryin...

The apparatus comprises around a nozzle supplying the mixture to be treated, a rotating sealed enclosure wherein an annular partition separates two chambers communicating together via a peripheral passage, containing chiefly the separated heavy phase and light phase and provided with thresholds for the draining thereof. According to the invention, the two chambers are equipped with separate centri...

A high-resilience, flexible or semi- flexible, flame-retardant, polyether- based polyurethane foam derived from a diol- or triol-based polyol which is at least 50% end-tipped with primary hydroxyl groups contains a flame- retardant system comprising, by weight, per 100 parts of the polyol: 30-80 parts alumina trihydrate; 5-20 parts antimony trioxide; and 3.6-36 parts chlorine provided by at leas...

The present invention relates to a process for the preparation of polyurethane foams capable of being flame laminated and high frequency welded, comprising reacting: (a) polyisocyanate, (b) a compound having a molecular weight of from 400 to 10,000 containing at least two isocyanate-reactive hydrogen atoms and (c) a dialkoxy-phosphonyl-N-alkyl-formic acid amide of the formula: wherein m...

PURPOSE:To make the cold working possible so as to obtain the titled metal pipe in which the bond strength is enough, by drawing a zinc-plated metal pipe to reduce the diameter by a die with the inner surface of the zinc-plated metal pipe being at the softening temperature of a vinyl chloride resin or below. CONSTITUTION:First the zinc-plated metal pipe (herein after referred to as the zinc-plated...

In an automotive disc brake, the main hydraulic seal 18 is arranged in a trapezoidal annular groove 21 so that it distorts into a parallelogram shape during brake application and provides a resilient retraction force for the piston 17 in the cylinder 16 when the cylinder is depressurised. A combined dust seal and retraction control means 19 incorporates an abutment means 26, 28 which grips the pis...