Abstract: An improved composite construction and method for fabrication of equipment having a corrosion resistant liner and an additional erosion resistant liner, in critical areas, on a base metal backing.

Abstract: A tennis racket assembly comprising a long structural member, a short structural member and two yoke pieces at the junction of said members. The long member extends from the grip end of the handle, up one side the handle, around the major portion of the ellipsoid head and down the other side of the handle to the grip end. The short member extends across the throat of the racket and completes the ellipsoid shape of the head, joining the long member at two junctions.Each yoke piece has the external shape of the letter "Y" and has at least two branch portions and a trunk portion. The trunk portion of each yoke piece is wrapped around a portion of the long member between the junction and the head of the racket, one branch portion of each yoke piece overlies a surface at one end of the short member, and the other end of each yoke piece overlies an opposite surface at said end of said short member.

Abstract: A roof drilling system which includes a drill bit with a hollow driven shank and coolant holes in the bit flutes connected to the inside of the hollow shank, a single driver unit connectible to the drill bit and also to extension driver elements which interfit with both the bit and the driver, all of the elements being hollow and connected by retainers which secure the parts during the drilling and aid in the withdrawal from the drilled hole.

Abstract: Columbium powder capable of producing anodes of improved electrical capacitance is prepared by the addition of phosphorus-containing materials in amounts from about 5 to about 600 ppm based on elemental phosphorus.

Abstract: In a mining machine in which pick bits or point attack bits are held in a chain or wheel which moves next to coal or rock, a replaceable tool which is formed with a rear extension that is essentially cylindrical, that extension being split in circumferentially spaced slots so that portions will move resiliently in a radial direction. Outer radial projections interlock with annular surfaces or shoulders of a holding block to retain the tool in an operating position. The tool may be driven in or out of position without the need of clips or retaining rings. They may then rotate in the holding block to equalize wear on the tip.

Abstract: An improved wall construction and method of fabrication is disclosed in which a wall assembly is comprised of a base metal layer of mild steel with a bonded intermediate layer of copper and a bonded layer of corrosion resistant material containing a fusion weld joining the steel base metal members with the root of the fusion weld abutting an inlaid insert of the corrosion resistant material, a fusion weld joining the layer of corrosion resistant material of the members to each other and to the inlaid insert of corrosion resistant material to provide a relatively smooth surface in the corrosion resistant layer, with the intermediate copper layer removed from the weld areas.

Abstract: A novel structural member, such as a tennis racket frame, having an unusually high strength to weight ratio is provided comprising an expanded foamed plastic core integrally bonded to a shell comprising at least one layer of resin-coated unidirectionally oriented graphite fibers, the shell completely encasing the core at any transverse cross section of the structural member, with a seamless sleeve made of a thin, flexible cellulosic film between the core and the shell.The structural member is prepared by arranging within a mold cavity an outer shell comprising at least one sheet of resin-coated unidirectionally oriented graphite fibers and a core comprising a foamable resin composition while the core is maintained within a seamless sleeve made of a thin, flexible cellulosic film, sealing the mold cavity and activating the foamable resin composition to cause expansion and generate pressure within the mold cavity and thereby provide intimate bonding of the core to the shell.

Abstract: A novel structural member, such as a tennis racket frame, having an unusually high strength to weight ratio is provided comprising an expanded foamed plastic core integrally bonded to a shell comprising at least one layer of resin-coated unidirectionally oriented graphite fibers, the shell completely encasing the core at any transverse cross section of the structural member with a veiling strip wrapped around said core beneath the innermost or beyond the outermost of the graphite fiber layers, or both.

Abstract: Tantalum and tantalum-rich alloys, particularly in wire form, are stabilized against embrittlement by the addition of 50 to 700 parts per million of silicon and optionally with the further addition of 100 to 500 parts per million of carbon.

Abstract: A novel structural member, such as a tennis racket frame, having an unusually high strength to weight ratio is provided comprising an expanded foamed plastic core integrally bonded to a shell comprising at least one layer of resin coated unidirectionally oriented graphite fibers, the shell completely encasing the core at any transverse cross section of the structural member.The structural member is prepared by arranging within a mold cavity an outer shell comprising at least one sheet of resin coated unidirectionally oriented graphite fibers and a core comprising a foamable resin composition, sealing the mold cavity and activating the foamable resin composition to cause expansion and generate pressure within the mold cavity and thereby provide intimate bonding of the core to the shell.

Abstract: A novel composite dart body having an unusually high mass to diameter ratio is provided comprising a central body portion of high density metal having a density of at least 18.5 g/cm.sup.3 bonded to front and rear body ends of readily machinable materials.

Abstract: A wall assembly and method for making the same which consists essentially of a layer of first metallic material and a layer of second metallic material, each layer having one face in a face-to-face contact, either bonded or unbonded relation with a face of the other layer, containing a fusion weld joining two members of the first layer, and fusion welds joining the layer of second material of such member in edge abutting relation to an inlaid insert over a flush insert of second material inset into said first layer so as to provide a relatively smooth surface in the second material of the wall.

Abstract: An improved composite wall construction and method of fabrication is disclosed in which a wall assembly is comprised of a base metal layer and a layer of corrosion resistant material containing an intermediate filler of base metal fusion welded to the original base metal members and to an inlaid insert of base metal at the weld root, and a fusion weld joining the layer of corrosion resistant material to provide a relatively smooth surface in the corrosion resistant layer.

Abstract: An improved composite wall construction and method for fabrication or repair of equipment having layered metals forming a corrosion resistant liner on a structural metal backing which includes fusion welding the abutting ends of the backing metal to an interposed base strip, bridging these ends and welds with an inlay strip of liner material underlying the ends of the liner material, and fusion welding the ends of the liner material to each other and to the inlay strip.

Abstract: An improvement in mining tools of the rotary and replaceable type which includes a retainer in the form of a double ball spring detent to provide axial retention, easy removability, and to permit ready rotation of the tool in a collet while preventing the build up and impaction of dust which will inhibit rotation or removal.

Abstract: Improved, high-purity agglomerated tantalum powders characterized by exceptionally high green strength when pressed without using a carbonaceous binder into low density anodes and high electrical capacitance along with low direct current leakage and dissipation factor in the anodes after sintering.

Abstract: Tantalum powder capable of producing anodes of improved electrical capacitance is prepared by the addition of phosphorus-containing materials in amounts from about 5 to about 400 ppm based on elemental phosphorus. In one embodiment, the flow properties of the powder are also improved.

Abstract: A method of repairing a wall of chemical process equipment is disclosed which is particularly suitable for repairing a vessel having an outer shell and an inner liner having tantalum as a base constituent wherein the liner has a fault such as a corrosion pit. The fault is repaired by drilling a hole through the fault, liner and shell, the diameter of the hole through the liner being at least as great as the diameter of the fault. A lifting means such as a screw is inserted into the hole to raise the liner away from the shell. The hole through the shell is enlarged, the screw is removed from the liner, and the area between the raised portion of the liner and the shell is cleaned. An insert having tantalum as a base constituent is inserted into the hole, the areas on both sides of the insert are evacuated and purged with an inert gas, and the insert is welded to the liner to form a seal therebetween.

Abstract: An anode for electrolytic devices formed from pressed and sintered compacts of an agglomerated refractory metal powder comprised of polynodal granules of adhered particles with the nodes being of a size the same order of magnitude as the size of the individual particles. Such agglomerated powder is produced by the method including the steps of heating a powder under chemically non-reactive conditions to effect agglomeration between the powder particles, and subsequently crushing the resultant particulate porous agglomerated mass to form said agglomerated polynodal granules. The anodes combine low green and sintered density, equivalent series resistance, dissipation factor and D.C. leakage with a high specific capacitance.