Abstract: A composite wafer bonded to a carbide substrate is formed by preparing a dispersion of super-hard crystals and carbon black in a temporary binder such as paraffin, by preparing a base mixture of carbon fiber, carbon black and filler in the temporary binder, and by preparing an additional mixture of cobalt and carbon black in the temporary binder. The dispersion, base mixture and additional mixture are compacted to form an intermediate composite, the additional mixture forming a layer on one surface of the base mixture. The intermediate composite is heated to allow for the removal of the temporary binder and the infiltration of liquefied silicon into the composite which is then reaction sintered to form the composite wafer.

Abstract: A means for producing nitride bonded refractory shapes, in situ, by mixing an aluminum metal powder, relatively pure silica, crude clay and a refractory aggregate. The mixes are pressed into shapes and burned at elevated temperatures in a nitriding atmosphere to form the bond.

Abstract: The grinding media is formed of a concentration of agglomerate free hard particles exceeding 50 percent by weight of the media, wherein the particles are chelated by a dispersing agent, surface treated with a surfactant, mixed with polyether polyol and polyisocyanate plus a catalyst and water and thereafter rapidly cured in a closed mold which has been preheated to a temperature exceeding 50.degree. C. and a pressure of 60 to 120 PSIG. The water reacts during curing to create a polyurea linkage and release CO.sub.2 as a blowing agent. The resulting media has a low elastic modulus with particles retained in a polyurethane-urea binder system. The media composition may also include an inorganic filler such as glass fibers not exceeding 30 percent by weight of the media.

Abstract: A method and apparatus for preparing thin layers, such as thin gel layers useful in electrophoresis, wherein a liquid layer material is introduced to the space defined between two parallel mold surfaces on first and second mold elements. Initially, the mold surfaces overlap each other to a small extent, and liquid is introduced to the space between the surfaces adjacent the leading edge of the top mold element. The mold elements are then shifted with respect to each other while maintaining their parallel relationship, and additional liquid layer-forming material is introduced to the space during the shift. In a preferred embodiment, a third mold element is situated adjacent to and spaced a small distance from the bottom mold element, and liquid material is introduced to the space between the bottom mold elements during shifting of the top mold.

Abstract: The invention relates to a process for the production of coupling pieces which possess an undercut annular groove optionally provided with a sealing ring, in which process a sleeve, having an internal diameter which increases in steps towards the open end, is initially preformed, the terminal part of the sleeve is postformed in order to form the annular groove, after having optionally introduced a sealing ring into the preformed sleeve, and, during preforming, only the terminal part of the preformed sleeve is kept at the deformation temperature and the remainder of the preformed sleeve is cooled, the terminal part of the preformed sleeve being cooled after postforming.

Abstract: The invention provides resin compositions which are particularly suitable for utilization in electron cured coated abrasives. The resin systems of the instant invention have been devised to be particularly suitable for the backing fill of a cloth which is to form the base of a coated abrasive. The formation of a treated base cloth for coated abrasive formation by electron beam curing resins creates a product which in addition to being suitable for immediate formation into a coated abrasive by application of grain is further a product which may be stored for later use or sold to other parties that have need for a waterproof stretch-resistant cloth or that make coated abrasives without doing cloth finishing. The invention also encompasses the formation of electron curing resin systems which are particularly desirable for the make coat and size coat utilized in forming coated abrasives.

Abstract: A method and apparatus for fusing and shaping the end of a rope, cord or the like made of heat fusible fibers avoiding the enlarged or bulbous end which normally occurs when heated in a conventional manner. The method involves inserting the cut end of a rope into a cavity of a member wherein the cavity tapers inwardly in a direction from an open end thereof to a closed bottom end, heating the member to melt the end of the rope thereby fusing together the strands and cooling the heated end of the rope to set the fused ends and shape the same to the internal shape of the cavity. The apparatus is a thin-walled, metallic member conically shaped and located at the end of a handle. A flared sleeve is also provided in which the end of the rope to be fused is inserted to compress the strands together before being heated. The conical member maybe heated by a butane torch or the like or alternatively, an electric resistance heating element maybe incorporated in a stem projecting from the handle.

Abstract: The continuous casting of scoops upon tapes for a sliding clasp fastener which includes two casting rollers with peripheral cavities and an extrusion nozzle with juxtaposed tapes introduced between the nozzle and a first one of the rollers. The arrangement is such that molten plastics is introduced by the nozzle firstly into the cavities of the first roller ahead of the nip between the rollers and subsequently into the cavities of the second roller adjacent the nip. To ensure adequate solidification of the scoops before removal from the second roller the tapes are drawn off from said second roller at an angular position thereof beyond the nip.

Abstract: The polishing composition for a centrifugal magnetic-abrasive machine for machining complex profiled workpieces. The composition exhibits ferro-magnetic properties and could be used in all centrifugal and magnetic-abrasive machines but more particularly in the combined centrifugal magnetic-abrasive machines wherein high roughness grades of the machined surfaces are obtained from comparatively low speeds of centrifugal packing and low magnetic field intensity. The composition is made of a 84-86% mixture of abrasive grains and iron-powder; 4-6% of a mixture of chromium sesquioxide, stearine, and oleic acid; 4-6% ground fruit pits or sawdust; and 4-6% of a 3% aqueous solution of triethanolamine soap. In their respective mixtures the abrasive grains are 5-40 mm in size and amount to 16-20%, the iron-powder amounts to 80-84%, the chromium sesquioxide of the 1-10 mm grain size amounts to 55-57%, the stearine amounts to 37-39%, and the oleic acid amounts to 5-7%.

Abstract: Dough is dispensed from the bottom of a dough hopper with a screw conveyor that slices into the dough mass and moves the dough horizontally out of a lower opening in the hopper and through a discharge conduit and discharge nozzle. The screw conveyor divides the conveyed dough into batches and the dough is worked in the discharge conduit and air from about the batches of dough is vented from the discharge conduit prior to extruding the dough through the discharge nozzle.

Abstract: Method for the stabilization of molded parts. Stabilization is achieved for parts ejected from a molding machine, by immersing the parts in a fluid medium during the course of their conveyance from a molding site. The result is thermal and/or fluid modification which gives stability to the parts, allowing them to be controllably conveyed away for further processing. This can permit early ejection of parts from the molding machine and enhance production capacity.

Abstract: An elastomeric surgical glove with an improved ring rolled cuff and a method and apparatus to produce the cuff is disclosed. The ring rolled cuff comprises alternating tightly rolled segments with loosely rolled segments. The ring rolled cuff is made by contacting the uncured glove on the glove form with a plurality of rotating wheels while the wheels are moved on the form from the wrist end of the form toward the hand end of the form. The portions of the cuff in contact with the wheels are tightly rolled, and the remaining portions are loosely rolled.

Abstract: A blank adapted to be mounted on a substrate to form a cutting insert is formed by preparing a crystal dispersion of super-hard crystals, such as diamond or cubic boron nitride crystals, and carbon black in a temporary binder, and a core dispersion of carbon fiber, carbon black and filler in a temporary binder. The crystal dispersion and the core dispersion are placed in a mold to respectively form a core dispersion layer and a crystal dispersion layer which forms a ring about the periphery of the core dispersion layer on the upper surface thereof. The crystal and core dispersion layers are compacted with a chamfered plunger applied to the lower surface of the core layer to form an intermediate composite having a recess at the lower surface thereby compressing the dispersions to a substantially uniform compaction throughout the intermediate composite. The intermediate composite is then heated to allow for the removal of the temporary binder and the infiltration of liquified silicon.

Abstract: A method and apparatus for spin casting a castable material into a cylindrical body. The method comprises the steps of rotating an elongated cylindrical body about its longitudinal axis, applying an extrudable uncured material as a continuous stream in helical fashion from one point in the body to another point, continuing to rotate the body until the material is leveled and at least partially curing the material while continuing to rotate the body. The apparatus comprises means for holding and spinning an elongated cylindrical body, and extruder means for providing a continuous stream of an extrudable uncured material in a desired fashion along the inside of the cylindrical body.

Abstract: A flap-type rotary abrasive device comprising a plurality of leaves of flexible material, arranged in an annular array having a central bore. End caps having annular passageways are provided to seal the central bore. A predetermined amount of a settable securing material having a liquid and a solid state, such as epoxy, is injected while in a liquid state into the central bore of the array so that a portion of the injected material contacts the inner edges of the leaves and a portion is caused to flow between the leaf edges adjacent the annular passageways formed by the end caps. Upon setting or solidification, the securing material, in conjunction with the two end caps, provides a core in which the leaf inner edges are solidly and firmly secured.

Abstract: A cathode structure for a sodium sulphur cell is formed by putting a fibre matrix into a mould which is closed to shape the matrix to the required form with compression of the fibrous material, the mould being kept at a temperature below 12.degree. C. and preferably between 8.degree. and 10.degree. C. while liquid sulphur is injected into the compressed fibre material.

Abstract: Plaster products can be prepared from calcium sulfate dihydrate by adding to a water slurry of calcium sulfate dihydrate a potassium salt, especially potassium hydrogen-carbonate or potassium tetraborate but, in the first place, potassium sulfate, including a carrier, after which the water slurry is moulded and further worked in known manner to the desired plaster product, especially plaster board or moulds for the production of metal articles or ceramic articles.

Abstract: A process for producing a silicon nitride sintered product having high toughness is described, comprising blending from 97 to 57% by weight of metallic silicon powder having a maximum particle size of 25 .mu.m or less with from 1 to 15% by weight, calculated as TiN, of a TiN powder having a maximum particle size of 20 .mu.m or less or a powder of titanium component capable of changing into TiN during reaction sintering, and from 2 to 28% by weight of one or more components selected from the group consisting of AlN, Al.sub.2 O.sub.3, SiO.sub.2 and oxides of rare earth elements, molding the resulting mixture, carrying out reaction sintering in a nonoxidizing atmosphere of a nitrogen gas or a nitrogen-containing mixed gas, and thereafter resintering in the same atmosphere at a temperature of from 1,600.degree. C. to 2,200.degree. C.

Abstract: A ceramic insulator body for receiving and electrically isolating two parallel terminal rods is manufactured by radial isostatic compaction of a ceramic powder about a core member having an hourglass cross section. The core member produces a bore comprising two parallel terminal-receiving channels connected by a constricted passage that is sized and shaped to space apart two terminal rods in the channels.

Abstract: The cutting rate and useful life of conventional resin bonded coated abrasive products in extremely high pressure abrading operations is significantly increased by using abrasive mineral which consists essentially of fused zirconia. Substantial amounts of diluent may be included, e.g., by blending other less effective abrasive grains with fused zirconia grains or by crushing a hardened co-fusion of alumina and zirconia.