Abstract: Tungsten is recovered from tungsten ore concentrates in the form of sodium tungstate by a basic process in which ground ore is first digested in a sodium hydroxide solution followed by diluting the solution to dissolve sodium tungstate separating the solution from the caustic insoluble sludge and crystallizing soluble sodium tungstate, wherein the present invention permits improved recovery of tungsten from difficult to process ores by the process steps of comminuting said tungsten ore concentrate to a particle size less than about 200 mesh, dispersing the comminuted ore to separate agglomerated particles, adding the dispersed ore to aqueous sodium hydroxide at a concentration of at least 10 molar and digesting at a temperature of from about 75.degree. C. to 150.degree. C. for a sufficient period of time to convert substantially all of the tungsten values to soluble sodium tungstate, and diluting the mixture to reduce the sodium hydroxide concentration to between about 4.5 and 5.

Abstract: Tungsten is recovered from tungsten ore concentrates in the form of sodium tungstate by a basic process in which ground ore is first digested in a sodium hydroxide solution followed by diluting the solution to dissolve sodium tungstate separating the solution from the caustic insoluble sludge and crystallizing soluble sodium tungstate, wherein the present invention permits improved recovery of tungsten from difficult to process ores by the process steps of comminuting said tungsten ore concentrate to a particle size less than 325 mesh, adding said comminuted ore to aqueous sodium hydroxide at a concentration of at least 10 molar and digesting at a temperature of from about 75.degree. C. to 150.degree. C. for a sufficient period of time to convert substantially all of the tungsten values to soluble sodium tungstate, and diluting the mixture to reduce the sodium hydroxide concentration to between about 4.5 and 5.5 molar at a temperature below about 90.degree. C.

Abstract: Selected portions of metal carbide are recovered from scrap material containing pieces of cemented metal carbide having various compositions of metal carbide distributed in a matrix material. The scrap material is treated with a suitable liquid for a sufficient period of time to dissolve the matrix material and form a piece of matrix depleted metal carbide which is introduced as a feed into a ferrofluid material. A magnetic field is passed through the ferrofluid for positioning pieces of metal carbide of the type having a heavier density spaced from pieces of metal carbide of a lighter density. The separated portions of matrix depleted metal carbide are collected to produce metal carbide powder which may be further reprocessed to produce a desired cemented metal carbide.

Abstract: In a process for producing fine size cobalt metal powder from scrap material containing brazing compositions, the scrap is digested with hydrochloric acid to produce an aqueous cobalt acid chloride solution containing copper and silver ions which ions are removed by cementation with iron to result in a cobalt chloride solution which is processed to fine cobalt metal powder.

Abstract: A cutting insert of the indexable type comprises intersecting surfaces which form a pair of chip control channels associated with a respective cutting edge. The channels merge at respective corners and terminate at an intermediate land portion which is arcuate and extends inwardly from a respective side surface at an angle less than ninety degrees.

Abstract: Tungsten is reclaimed from heavy metal alloys of the type having tungsten metal dispersed throughout a matrix material by treating the heavy metal alloy with zinc to form a molten mixture and separating the zinc from the resulting alloy.

Abstract: A cutting insert of the indexable type comprises intersecting planar surfaces which form a pair of chip control channels associated with a respective cutting edge. The channels merge at respective corners and terminate at an intermediate land portion which is interposed one planar surface and the lowermost portion of the channels.

Abstract: Fine particle size cobalt metal powder is prepared absent tailings by heating an aqueous solution of soluble cobaltic ammine halide to a temperature of at least about 120 degrees centigrade for a sufficient period of time to decompose said cobaltic ammine halide and form a cobalt containing precipitate. The precipitate is separated from the solution and reduced in a reducing atmosphere to produce fine metal cobalt powder.

Abstract: An alloy lead-in wire of molybdenum and tantalum which has gettering properties and a method of making the lead-in wire is described.

Abstract: A uniform mixture of refractory metal carbide, binder metal and a pressing aid is achieved by fluidizing the mixture.

Abstract: A cutting insert of the indexable type comprises intersecting surfaces which form a pair of chip control channels associated with a respective cutting edge. The channels merge at respective corners and terminate at the intermediate land portion which is arcuate and at an angle of ninety degrees or greater to a respective side surface.

Abstract: An electrical contact for a connector of the type used for engaging the edge portion of a printed wiring board has a U-shaped walled section with a pair of leg sections joining a bight section. A pair of flat inwardly bowed tines extend upwardly from respective upper portions of each leg section. An elongated member depends from an upper portion of the bight portion and extends downwardly through a reverse bend and includes a lower depending tail portion.

Abstract: An apparatus for terminating a plurality of conductors to a connector includes an elongated frame having a connector holding fixture at one end and a carriage mounted for sliding movement toward the fixture for effecting termination of the connector. Movement of the carriage is effected by a beam having a pivotable joint mounted intermediate the carriage and fixture so that movement of the pivotable joint in direction normal to the longitudinal direction of the frame moves the carriage toward and away from the fixture member.

Abstract: Printer wire assemblies for dot matrix printers are characterized by a copper layer on the tungsten wire extending beyond the base portion inside the pin socket, to protect the wire from the embrittling effects of brazing, by braze-forming layers on the copper layer and by a blind-hole pin socket, to enable ease of assembly and braze-bonds of uniformly adequate mechanical strength.

Abstract: A refractory body having acid resistant properties consists of a metal carbide dispersed throughout a metal matrix of ruthenium or alloy thereof. An elongated member of the above composition having an opening therein is used as a guide for precious metal wire.

Abstract: A cable connector having a pluggable portion which provides for rapid connect and disconnect of a cable with a circuit board includes a latching member projecting below the pluggable portion which is adapted to snap-lock with an exterior portion of a receptacle.

Abstract: A lubricating oil additive is produced by contacting an aqueous slurry of ammonium paratungstate with an organic phase comprising a major proportion by weight tertiary alkyl amines having the formula C.sub.n H.sub.2n+1 NH.sub.2, where n is from 18 to 22, to extract the tungsten into the organic phase from the aqueous phase while solid ammonium paratungstate is being solubilized into the aqueous phase. The aqueous phase is heated to drive off water so as to form the resulting lubricating oil additive.

Abstract: An electrical contact of the type having a working surface and comprising a ductile metal and weld inhibiting material includes a wetting agent present in an amount sufficient to reduce the surface energy between said contact surface and the liquid phase of the ductile metal. Improved wettability of the surface results in reduced arc erosion due to the spattering loss of ductile metal. Also, described is a method for selecting and testing proposed additives.

Abstract: An extractor tool which is suitable for removing a connector of the type having a latch for releasably fastening the connector to a support member includes first and second connector gripping members mounted for movement toward and away from one another in a given direction. The connector gripping members are normally biased in an open position with hand actuated means being provided for moving the gripping members to a clamping position. A latch engaging member is mounted on at least one of the gripping members for movement in a direction substantially normal to the given direction and includes a wedge-shaped end which engages and releases the connector from the support member.

Abstract: A cable connector having a pluggable portion which provides rapid connect and disconnect of a cable with a circuit board has a pair of retaining flanges holding a top and bottom body in proper position to form the pluggable portion. The top and bottom bodies are provided for engaging respective individual cable conductors and providing contact engaging portions associated with the pluggable portion.