Abstract: A rechargeable current-generating cell is disclosed, composed of(a) an anode made of lithium or its alloys;(b) a non-aqueous electrolyte solution with a solid electrolyte or a molten electrolyte; and(c) a cathode of a vanadium-substituted alkali thiochromite having the general formula Na.sub.y Cr.sub.l-x V.sub.x S.sub.2, wherein x lies between 0.05 and 0.3 and y is 1 for the stoichiometric compound and from 0.1 to 0.4 for the non-stoichiometric one. The non-stoichiometric compound is obtained from the stoichiometric compound, by electrochemical oxidation thereof, either in the cell, after its assembly, or in a non-aqueous electrolyte solution in a separate vessel, prior to assembly of the cell. The non-stoichiometric compound can also be obtained by chemical oxidation of the stoichiometric one in a nonaqueous solution of iodine.

Abstract: Apparatus for the continuous vacuum cleaning of oil operating on the principle of continuous alteration of a compression, and of a separating cycle, by utilizing a combined action of quasistationary processes instigated by reduced pressure and of non stationary processes generated by a hydrodynamic cavitator. Due to a repeated circulation of the oil filling through a non-stationary and a quasistationary separating process, a high purity of oil, which is subsequently forced back into the container of the oil system, or of an electric transformer, respectively, is achieved and simultaneously a safe removal of contaminations.

Abstract: An improved method for manufacturing membrane battery separators by grafting a vinyl monomer onto a polyolefin film. The method includes irradiation of the film by ultraviolet rays and subsequent grafting of the said film in a five-layer sandwich. The sandwich comprises the irradiated polyolefin film which is covered on each side with a layer of a cellulosic tissue soaked with the monomer or a solution of the monomer, and each cellulosic layer on its turn is covered by an inert polymeric film. The layers of the sandwich are not limited in length and the sandwich is transported at a constant speed over the surface of a heater, maintaining the sandwich at a constant temperature in the range 85.degree. to 95.degree. C. with an accuracy of .+-.1.degree. C. The grafting of the polyolefin film in the sandwich proceeds continuously and isothermally, while it is in contact with the heater surface under a pressure of 10 to 30 g/cm.sup.2 during 10 to 45 minutes.

Abstract: Powdered wetproofed materials, useful for the manufacture of gas-diffusion electrodes, are produced by forming a suspension of an electroconductive powder in a liquid which is water or an organic solvent in the presence of a wetproofing agent and recovering the wetproofed material.

Abstract: A method of obtaining alkaline battery separators. Such method comprises ultraviolet irradiation in the presence of a sensitizer and oxygen contained in the air of low density polyethylene film at ambient temperature and normal pressure to effect cross-linking and subsequently graft polymerizing an ethylenically unsaturated carboxylic acid monomer into the irradiated film under the action of heat and compression of the film.