Abstract: An improvement in an air intake for an aircraft engine, particularly a prop-jet engine, which intake is ring-shaped at the forward part thereof and has a central, non-rotatable body mounted in said intake, which together form an intake diffuser, the improvement comprising a displaceable inlet lip on said intake, said lip being displaceable to sealing contact against said central body and against the direction of air onflow, and said lip in said sealing contact position forming a ring-shaped inlet gap behind said lip.

Abstract: This invention relates to a process for the enrichment and recovery of europium chloride in a mixture of rare earth halides which comprises adding sufficient alkali, alkaline earth, or rare earth fluoride to a melt of rare earth halides that the melt contains at least 4% by weight of fluoride, electrolyzing the mixture in the melt, separating residual salts, cooling, and washing said residual salts with water.

Abstract: This invention relates to a process for the production of a thermoplastic synthetic material of chemically modified protein, which comprises mixing an aqueous alkaline protein solution with an aqueous solution of a tetrafunctional, doubly unsaturated, organic compound of the general formula ##STR1## in which R.sub.1 is hydrogen or an alkyl group with 1 to 18 carbon atoms,R.sub.2 is hydrogen or an alkyl group with 1 to 6 carbon atoms, andR.sub.3 is hydrogen or an alkyl group with 1 to 3 carbon atoms,Subjecting the mixture to a dwell time, causing a precipitating liquid to act upon it, freeing the formed precipitate from excess liquid, and drying. The invention also relates to a shaping material of plastic material of chemically modified protein and a chemical plasticizer. The invention also relates to a plastic material of modified protein.

Abstract: This invention relates to an improvement in the method for the cold-milling of a cellulose derivative, in which the cellulose derivative is cooled by means of liquid nitrogen until it becomes brittle and the thus cooled cellulose derivative is milled in a mill, the improvement comprising cold-milling a cellulose derivative which is soluble or swellable in water and has a water content of between 40 and 150 percent by weight, based on its dry weight, and which is, at 20.degree. C, able to absorb, during swelling, more than 150 percent by weight of water, based on its dry weight.

Abstract: This invention relates to a process for preparing carbonated zirconium oxide hydrate which comprises adding zirconium oxychloride . 8 H.sub.2 O to a saturated aqueous ammonium chloride and/or alkali chloride solution which, based upon zirconium oxychloride . 8 H.sub.2 O, contains at least equimolecular amounts of ammonium carbonate and/or alkali carbonate,Separating the resulting precipitated reaction product,And washing said product chloride-free with water.

Abstract: This invention relates to a stretched, shrinkable, tubular film of polyethylene terephthalate which has a lower initial point of shrinkage, higher shrinking values, and improved weldability, in which part of the ethylene glycol component is replaced by about 0.5 to 10 mole per cent of bis-phenol-A-bis-(2-hydroxyethyl)-ether.

Abstract: Apparatus for producing positive enlarged copies from positive or negative microfilm, in which the photoconductive element can be charged either negatively or positively so that one developing liquid containing particles of only one polarity can be used to create positive copies regardless of whether the original microfilm is positive or negative. The apparatus includes a reusable photoconductive web having an aluminum backing, a perforated development electrode, and a transfer station for transferring the developed image to paper.

Abstract: A porcelain tooth structure and method of making the same in which a powder-form porcelain is mixed with an adhesive, in an amount suffficient to form a coherent mass of the porcelain, to form a workable paste, the paste is formed into a tooth structure having the general shape of a desired, finished tooth, preferably by molding in a metal, plastic or rubber mold, the molded tooth is dried, generally at a temperature between ambient temperature and about 600.degree. F and the adhesive in at least a part of the tooth structure is rendered water-resistant by utilizing an inherently water-resistant adhesive or treating a water-soluble adhesive with an agent which renders the adhesive water-resistant, such as a solvent, a hardening agent for the adhesive, a water-immiscible oil or another agent which combines with the adhesive by chemical reaction, physico-chemical reaction or physical action, either during the mixing of the porcelain and adhesive or after the drying of the tooth structure.

Abstract: This invention relates to an improvement in a cloth take-up motion for looms with gradual or intermittent taking-up of cloth in which a take-up roller is adapted to be driven by drive shaft means and gear system means, and wherein the drive shaft executes one revolution with each weft insertion, the improvement comprising crank means and pin means on said drive shaft means, Maltese cross means in which said pin means is adapted to engage, and reduction gear means connecting said Maltese cross means with said take-up roller.

Abstract: This invention relates to an improvement in the method for repairing a damaged iron mold and similar casting devices by bridging the damaged area with a metal plate and securing the plate by means of fastening elements inserted into apertures in the plate and prepared recesses in the iron mold, the improvement comprising inserting expansible straddling dowels in said apertures and recesses, and expanding said dowels with a powder-force-actuated setting device.

Abstract: A process and apparatus for exposing light-sensitive printing plates through an original to be copied, which includes forming a cassette-type, vacuum frame assembly by superimposing the printing plate and the original upon one another and disposing them in a cavity formed between an elastic blanket and a light-permeable plate, and evacuating the assembly, to improve contact between the printing plate and the original, at a position removed from a light means, thereafter temporarily placing the assembly in a position to be exposed to the light means and finally removing the assembly from the exposure position. A vacuum frame assembly is provided having a connect-disconnect means for temporary attachment both to the evacuation means removed from the light source and, if desired, to an evacuation means at the exposure position.

Abstract: This invention relates to an improvement in an apparatus for recording or erasing an electrostatic image by deforming a photoconductive thermoplastic layer of a recording material by heating, including support means for said recording material, charging means for charging the recording material, exposure means for exposing said material, and heating means for developing or erasing said material, the improvement comprising groove means in said support means, above which said recording material is adapted to be continuously conveyed in a self-supporting manner and is adapted to be deformed above said groove means during the recording or erasing.

Abstract: This invention relates to a biaxially stretched and longitudinally afterstretched thin-walled tubular film of polyethylene terephthalate having a tensile stress of 40 to 60 kg/mm.sup.2 and a tear resistance of 40 to 70 kg/mm.sup.2 in the longitudinal direction, and an elongation at break of 350 to 800% in the transverse direction. The invention also relates to a process for the production of the film.

Abstract: This invention relates to an improvement in the process for the production of a planographic printing form in which a carrier coated with a hydrophilic layer composed of a non-light-sensitive compound is imagewise exposed, the improvement comprising imagewise exposing the layer to laser radiation, whereby the material obtained may be used for printing in a planographic printing machine without further treatment.

Abstract: This invention relates to a compound of the formula ##STR1## wherein R is a phenylene or naphtylene group. The invention also relates to a process for making the novel compounds of the invention and also to an electrophotographic recording material employing the novel compounds of the invention.

Abstract: This invention relates to an electrophotographic recording material comprising an electrically conducting carrier and a photoconducting laminate thereon, the latter comprising a base layer and a top layer each containing an organic photoconductor, binder and sensitizer, at least one organic photoconductor being common to both of said top and base layers and the base layer containing a bisazo dyestuff.

Abstract: An electrically-controlled, hydraulically-actuated valve, having an inlet joined to a main outlet through a pressure regulating chamber; a by-pass passage joined to the pressure regulating chamber through a second enlarged chamber coaxial with the first; a valve seat formed at the juncture of the two chambers; a slidable valve, having one end tapered to seat in the valve seat and coaxially passing through the second chamber; a flow restricting viscosity non-influenced orifice in the inlet passage to form a jet of the introduced fluid; a blind hole extending into the body of the valve from the first chamber, directly opposite the discharge end of the inlet passage and coaxial therewith to avoid any jet stream impulse force on the tapered piston; a magnetizable core mounted on the other end of the valve; an annular electrical coil surrounding the core; and a biasing valve mounted in the discharge end of the by-pass passage and spring-biased against the flow of fluid.

Abstract: A carburettor for an internal combustion engine including a main duct and an auxiliary duct which receive air from a valved inlet, a main valve in each of the ducts for controlling flow through the ducts. Fuel is introduced into the auxiliary duct upstream of the main valve therein but downstream of an auxiliary valve in the auxiliary duct which is used to control the fuel to air ratio of the fuel/air mixture produced by the carburettor. The auxiliary valve is controlled in accordance with engine temperature, pressure drop across air filter, degree of dilution of recycled exhaust gases, degree of combustion of exhaust gases, temperature of air entering the engine, or atmospheric pressure.

Abstract: A process for replenishing developing medium in a developing chamber of a photoprinting machine and apparatus for performing the process. The process and apparatus for performing it utilizes at least one photocell in combination with various electrical and optical elements for measuring the concentration of developing medium in the developing chamber, comparing the measured value to a nominal value, and controlling the replenishing of the developing medium correspondingly.

Abstract: This invention relates to a light-sensitive copying composition for the preparation of screen printing stencils comprising a condensation product of an aromatic diazonium compound in admixture with a hydrophilic hardenable binder, the condensation product containing at least one unit each of the general types A(-D).sub.