Abstract: The filter device for air purification has an electrification grid supplied with a high voltage of negative polarity and arranged on a plane transverse to an air flow for negatively charging particles present in the air. A partition is arranged at an angle in front of the electrification grid so as to convey the stream of air toward a narrower region. A negatively charged deflector plate and a positively charged collector plate, which face one another at a short distance, delimit a respective narrower region for respectively repelling and attracting the negatively charged particles. A germicidal lamp is arranged at an opening of the deflector plate and illuminates the collector plate substantially along its entire length in a direction which is transverse to the air flow.

Abstract: A first recess for detachably mounting an ionizer therethrough is formed to oppose a dust-collecting air suction side of a precipitator machine body. The ionizer includes an ionizing wire unit having an ionizing wire, and a counterelectrode plate, which can be detachably assembled. A second recess for detachably mounting a dust collector therethrough is formed to oppose a dust-collecting air discharge side of the precipitator body. The dust collector captures and collects dust particles, charged by the ionizer, with a Coulomb force. The ionizer and dust collector are simultaneously electrically connected to the body when they are mounted on the corresponding recesses.

Abstract: A light-sensitive silver halide photographic material having a cellulose ester film support coated on one side with a silver halide emulsion layer and on the other side with a non-light sensitive layer that is removable during an aqueous processing step. An optional portion of the non-light sensitive layer is coated with a magnetic recording layer formed from a dispersion containing at least 60% by weight of 2-ethoxyethanol. The resulting magnetic recording layer exhibits layer adhesion during subsequent development steps.

Abstract: A method is disclosed herein for forming characters, figures, logos and the like on the surface of an article such as a record which is produced from a pattern. The pattern is formed initially according to customary techniques, and the characters are then chemically etched into the surface of the pattern so that the characters will appear in proper form upon the article produced from the pattern. The pattern may be formed from any metal or other material which may be chemically etched with sufficient resolution. The article formed from the pattern may be produced by a number of known processes such as molding, pressing or stamping. A particular application for the method of the present invention is in forming the general and proprietary information in the central portion of a phonograph or video tape record which may, for example, be stamped from the pattern.

Abstract: A video disc master of glass, having a metal surface with microscopic apertures therein representing information, is coated with a photosensitive resist. The resist is uniformly exposed through the glass disc. The unexposed resist is removed. The resulting disc having surface irregularities can be used in a first process to produce "stampers" for embossing replicas and, in a second process, to produce a mold for casting replicas.

Abstract: A photographic sound recording and reproduction method is disclosed wherein a sound track is formed by silver diffusion transfer processing. Film units suitable for this application are described which comprise a support, a layer containing silver precipitating nuclei, and a layer containing photosensitive silver halide crystals.In one embodiment, a photographic sound track may be produced in a silver diffusion transfer color motion picture film unit, which further comprises an optical color screen.

Abstract: A motion picture film having a soundtrack which is visible light-transparent, but fluoresces in the visible spectrum when submitted to ultra-violet radiation, and unexposed film for providing the product, and the method for producing the exposed and unexposed films including such soundtrack.

Abstract: A magnetic sound track layer can be formed with good adherence on the emulsion layer of a photographic material for motion picture film by coating from a liquid composition comprising ferromagnetic powders, a binder, and at least 1% by weight, based on the weight of said ferromagnetic powders, of p-toluenesulfonic acid and at least 3% by weight, based on the weight of said powder of glacial acetic acid. A motion picture film where the magnetic sound track contains p-toluenesulfonic acid and glacial acetic acid.

Abstract: The adherence of a magnetic sound strip to the surface of an anti-halation layer of a multi-layer motion picture film including at least one light-sensitive emulsion layer is enhanced by using as the alkali-soluble binder of the anti-halation layer a polymer containing free carboxyl groups and including in the coating composition of the magnetic strip an organic compound which contains at least two reactive halogen atoms reactive with the polymer carboxyl groups.

Abstract: A color photographic cine or TV film on which a sound recording band or track can be formed without the necessity for a specific additional treatment comprising a film base having thereon at least a silver halide emulsion layer containing a coupler capable of forming a dye by the coupling reaction with the oxidation product of an aromatic primary amino developing agent, and at least one of the emulsion layers of the color photographic material containing a bleach inhibitor in only the portion defined as the sound recording track.