Abstract: An inlet manifold is for use in a laser powder bed fusion system having a build platform for carrying a powder bed and a pump or blower for supplying a gas flow in a direction relative to a surface of the build platform. The inlet manifold is made of a gas flow guide structure having a gas flow inlet to receive the gas flow and being comprised of a plurality of stacked gas flow guides, each being defined by top and bottom guide plates oriented downwards at an angle A relative to the direction of the gas flow for guiding the gas flow downwards towards a gas flow outlet. At least some of the top and the bottom guide plates have upwardly curved ends at the gas flow outlet to redirect the gas flow to be substantially parallel to the surface of the build platform.

Abstract: Apparatus for managing a lottery distribution includes a plurality of lottery cards carrying a unique machine-readable code readable by a Point of Sale (POS) system for purchase and activation of the lottery card by a customer. Each lottery card carries in customer readable format only part of the game data, which is covered by a scratch-off, necessary for a determination by the customer whether the lottery card is allocated to be either a winner of a predetermined prize or a non-winner of the lottery and the lottery control system is arranged to communicate to the POS system the remaining information for said determination to be printed on a POS receipt for the customer so that the customer can read the printed data on the receipt along side or through the card to determine whether the card is a winner.

Abstract: An antenna comprised of a plurality of identical subarrays each having N antenna elements. The antenna elements of a core of subarrays all contribute outputs which are used for forming sum and difference beams. A peripheral area surrounding the core has subarrays which have a lesser number of antenna elements which participate in the signal processing operation to derive the sum and difference beams. The antenna elements of each subarray are combined in a manifold having one output, for the peripheral subarrays, and three outputs for the core subarrays. The manifold outputs are provided to various digital receivers which process the manifold signals with predetermined weighting functions. A digital beamformer processes the digital receiver outputs to derive the sum and difference beams which are used by a radar processor for tracking targets.

Abstract: An antenna having a tiled architecture with overlapping subarray in two dimensions is disclosed. Each tile has two orthogonal ports and there is no physical interconnection between adjacent tiles. The outputs are coupled to individual receivers. The outputs of ports from n adjacent tiles are digitally combined to form an overlapping subarray.

Abstract: An antenna having a tiled architecture with overlapping subarray in two dimensions is disclosed. Each tile has two orthogonal ports and there is no physical interconnection between adjacent tiles. The outputs are coupled to individual receivers. The outputs of ports from n adjacent tiles are digitally combined to form an overlapping subarray.

Abstract: A radar electronic scan apparatus 10 employs an array of transmit/receive phase-shift modules 14 with a plurality of ferrite phase-shift subarrays 16. Each ferrite phase-shift subarray has a pair of phase-shift ferrite substrates 32A and 32B mounted on a support with each substrate having four phase taps for connection to radiators of the electronic scan apparatus.

Abstract: A process for making silver chloride particles having an average particle size of less than about 25 microns comprising:(a) reacting silver metal particles having an average particle size of less than about 25 microns with chlorine gas in a chlorine-stable organic solvent for a sufficient amount of time to convert substantially all of said silver metal particles to silver chloride particles; and(b) recovering said silver chloride particles from said organic solvent.

Abstract: A process for producing a chloroisocyanuric acid compound which comprises reacting cyanuric acid with a chlorinating agent consisting of an aqueous solution of hypochlorous acid substantially free of ionic impurities having a pH of less than about 2. The process produces chloroisocyanuric acid compounds with reduced volumes of effluent solutions and significantly reduced amounts of gas released during operation. The novel process for producing chloroisocyanuric acid compounds can employ solid forms of cyanuric acid as a reactant.

Abstract: Compositions consisting essentially of calcium hypochlorite and a water soluble zinc salt, the compositions containing from about 40 percent to about 99 percent by weight of calcium hypochlorite, provide controlled release of the components for continuous and effective sanitation and algae control to waters treated for use in swimming pools and spas.

Abstract: Described herein is a process for the preparation of chlorohydrins by reacting a concentrated, aqueous solution of hypochlorous acid with at least one unsaturated organic compound having from 2 to about 10 carbon atoms and selected from the group consisting of substituted or unsubstituted olefins and cyclic olefins.

Abstract: A solid calcium hypochlorite composition contains calcium hypochlorite and an alkali metal salt of phosphonobutane polycarboxylic acid having an available chlorine concentration of at least 50 percent by weight.It has been found that the use of the novel compositions of the present invention can significantly reduce scale formation in dispensers for calcium hypochlorite particularly where water having high total alkalinity is used. The prevention or inhibition of scale formation is accomplished without harmfully affecting other properties of the pool water such as the pH.

Abstract: A process for producing hypochlorous acid by reacting an aqueous solution of an alkali metal hydroxide in droplet form with gaseous chlorine to produce hypochlorous acid vapor and solid alkali metal chloride particles in which the improvement comprises employing molar ratios of gaseous chlorine to the alkali metal hydroxide of at least about 22:1.The process achieves high yields of hypochlorous acid by minimizing side reactions including the formation of chlorate as an impurity in the alkali metal chloride particles produced.The hypochlorous acid solution produced contains from about 35 to about 60 percent by weight of HOCl, a dissolved chlorine concentration of less than about 2 percent by weight, and is substantially free of alkali metal ions and chloride ions.

Abstract: A solid calcium hypochlorite composition contains hydrated calcium hypochlorite and an alkali metal salt of phosphonobutane polycarboxylic acid having an available chlorine concentration of at least 50 percent by weight and a water content of at least 4 percent by weight.It has been found that the use of the novel compositions of the present invention can significantly reduce scale formation in dispensers for calcium hypochlorite particularly where water having high total alkalinity is used. The prevention or inhibition of scale formation is accomplished without harmfully affecting other properties of the pool water such as the pH.

Abstract: Disclosed is a process for producing methylphosphonic dichloride comprising reacting dimethyl methylphosphonate with a chlorinating agent selected from the group consisting of thionyl chloride and phosgene in the presence of a catalytic amount of an inorganic halide selected from the group consisting of ammonium halide and metallic halides where the metal cation is selected from the metals of Groups IA, IIA, IIIB, IVB, VB, VIB, VIIB, VIIIB, IB, IIB and IIIA of the Periodic Table.

Abstract: A sanitizing composition consisting essentially of a mixture of a calcium hypochlorite compound and a peroxydisulfate compound having the formula: M.sub.x S.sub.2 O.sub.8 where M is an alkali metal or alkaline earth metal, and x is 1 or 2 is employed in treating water to improve pH control and provide increased removal of organic materials.The compositions provide improved sanitation of water in swimming pools, spas, and cooling towers by efficiently oxidizing organic impurities while helping to minimize the increase in the pH of the water. This permits a reduction in the amount and frequency of addition of acidic compounds such as hydrochloric acid to the water bodies. Further, the incorporation of additives such as algaecides, dispersants, and clarifying agents provides for significant improvements in water quality as evidenced by sparkling pure water.

Abstract: A process for producing cyanuric acid which comprises feeding a urea hydrohalide compound to a pyrolysis zone.The urea hydrohalide compound is pyrolyzed to produce a solid reaction mixture of cyanuric acid and an ammonium halide. The solid reaction mixture is vaporized to remove the ammonium halide to form a gaseous mixture containing ammonia and hydrogen halide which is simultaneously removed from the pyrolysis zone. The cyanuric acid recovered is substantially free of ammonium halide.The novel process produces high purity cyanuric acid in the absence of liquid effluents while readily recovering the ammonia and hydrogen halide values.

Abstract: A process for producing a sodium compound comprises admixing trichloroisocyanuric acid, cyanuric acid, and sodium bicarbonate to form a homogeneous mixture. The homogeneous mixture is reacted with water and a sodium dichloroisocyanurate compound recovered. The novel process minimizes the cost of raw materials and maximizes the available chlorine present in the reaction mixture.

Abstract: Water sanitizing compositions are disclosed which are comprised of a mixture of trichloroisocyanuric acid and an alkaline earth metal solubility promoting additive selected from the group consisting of the bicarbonate, carbonate, hydroxide, oxide and mixtures thereof of said alkaline earth metal. The compositions have a molar ratio of said additive to trichloroisocyanuric acid of from about 0.3:1 to about 3:1 and a moisture content of less than about 0.2 percent by weight of the compositions.The novel compositions rapidly dissolve in water bodies such as those found in swimming pools, commodes, automatic dishwashers and the like to quickly provide a sanitizing amount of available chlorine for sanitizing the water.

Abstract: Water sanitizing compositions are disclosed which are comprised of a mixture of trichloroisocyanuric acid and an alkaline earth metal solubility promoting additive selected from the group consisting of the bicarbonate, carbonate, hydroxide, oxide and mixtures thereof of said alkaline earth metal. The compositions have a molar ratio of said additive to trichloroisocyanuric acid of from about 0.3:1 to about 3:1 and a moisture content of less than about 0.2 percent by weight of the compositions.The novel compositions rapidly dissolve in water bodies such as those found in swimming pools, commodes, automatic dishwashers and the like to quickly provide a sanitizing amount of available chlorine for sanitizing the water.

Abstract: A highly pure cyanuric acid is produced by a process which comprises gradually adding a nitrogenous material capable of producing cyanuric acid, such as urea, to a hot N-methylpyrrolidone solvent. The overall process converts substantially all of the urea to cyanuric acid which, upon drying, is a free flowing product capable of being converted into trichloroisocyanuric acid and similar compounds with a minimum of extra processing while allowing substantially complete recovery of the N-methylpyrrolidone solvent for reuse.