Abstract: An FRP plate spring member having spring characteristics of the invention has a protective layer of a resin formed on the entirety or part of the outer surface of an FRP base comprising a number of reinforcing fibers which are impregnated with and held in a cured matrix resin. A process for manufacturing such an FRP plate includes a step of applying a resin for forming the protective layer on the entirety or part of the inner surface of a mold for molding the FRP plate.

Abstract: When pipes are provided with comparatively rigid linings, the gaps which tend to appear between the pipe and the lining along the length thereof, and through which gaps gaseous type contents tend to escape, are sealed by providing between the pipe and the lining radially expandable sealing rings spaced along the length of the pipe, those rings compressing when the lining is in place and only partially expanding if the lining tends to separate from the pipe, thereby to provide a series of annular seals along the length of the pipe. The sealing rings may be positioned within the pipe before the lining is applied or may be initially secured to the lining and moved into place with the lining.

Abstract: The present invention relates to cemented carbide bodies preferably for rock drilling and mineral cutting. By having the bodies comprising a core of cemented carbide containing eta-phase surrounded by a surface zone of cemented carbide free of eta-phase and having a low content of cobalt in the surface and a higher content of cobalt next to the eta-phase zone the bodies have obtained an increased strength and life in practical use.

Abstract: A refillable applicator-buffer for applying and buffing wax on skis, toboggans and running surfaces of similar winter sports equipment.

Abstract: High strength, fracture tough, high temperature oxidatively stable, gas turbine engine core engine components are described made of silicon carbide fiber reinforced ceramic matrix or silicon carbide fiber reinforced glass matrix material. A gas turbine engine containing core engine components as above described is also disclosed.

Abstract: A magnesia aggregate for a refractory article, which comprises: a core portion comprising magnesia; a covering layer excellent in slag penetration resistance, which comprises a refractory material excellent in slag penetration resistance and covers the surface of said core portion; and an intermediate layer excellent in slag penetration resistance, formed between said core portion and said covering layer through combination thereof. Said magnesia aggregate is manufactured by: forming, on the surface of a core portion which comprises magnesia and has a particle size of from 40 .mu.m to 10 mm, a covering layer which comprises a powdery refractory material excellent in slag penetration resistance and has a covering thickness of from 20 .mu.m to 2.0 mm, to prepare a green aggregate; and firing said green aggregate at a temperature of from 1,700.degree. to 2,200.degree. C.

Abstract: An electroluminescent device includes a tin oxide electrode having a textured surface with a phosphor layer interposed between dielectric layers overlying the textured surface. The textured surface propagates through the overlying layers so as to reduce the amount of generated light trapped in the device structure and increase the output brightness of the device.

Abstract: A homogeneous fine grained metal film (6') on a substrate in accordance with the present invention comprises multiple metal layers and intervening layers (14) between the respective metal layers, the intervening layers being formed of a compound of the metal and a reactive gas and serving to suppress growth of grains (12') in the respective metal layers and to suppress electromigration of grain boundaries (13').In a method for manufacturing a metal film (6') having homogeneous and fine grains on a substrate in accordance with the present invention, one or more intervening layers (14) are formed by introducing a gas reactive with the metal film one or more times during deposition of the metal film, whereby intervening layers of a metal compound are interposed between the successively deposited metal layers. Thus, a metal film of a multilayered structure including multiple metal layers separated by the intervening layers is formed.

Abstract: A refractory batt for supporting green ceramic or refractory ware during firing thereof, wherein said batt includes a groove or recess diagonally oriented in each quadrant, with the bottom of the recess or depression merging smoothly at the ends into the upper surface of the batt and spaced from the center and corner. The depth of the recess in each quadrant is not more than two thirds the thickness of the batt.

Abstract: In a ski being equipped with metal edges, the tread (2) has, as seen in a cross section, a horizontally extending central area (2') and at both sides thereof lateral areas (4) extending in upward direction and being rigidly connected with the ski. The width of the central area (2'), extending, as seen in a cross section, in a horizontal plane, of the tread (2) is greater than the total width of the chamferred and upwardly extending areas (4) and the tangent lines applied to the lateral areas (4), extending at least over the width of the steel edges, and normally extending relative to the longitudinal direction of the ski include one with the other an obtuse angle of 170.degree. to 179.degree., preferably 174.degree. to 178.degree., having its apex located below the tread (2) in the vertical longitudinal center plane (6) of the ski. The width of an upwardly extending lateral area (4) of the tread (2) is smaller than 10 mm. This width can approximately correspond to the width of a steel edge.

Abstract: A process for applying an aqueous mixture of a magnesium phosphate cementitious material to a base material in which the resulting bond between the materials is improved. In this method the base material is coated with a passivating agent capable of reducing the pH of the surface of the base material prior to applying the aqueous mixture of magnesium phosphate cementitious material. The base material can be a hydraulic cementitious material, e.g., Portland cement. The cementitious material is magnesium phosphate quick-setting cement. Preferred passivating agents can be aluminum acid phosphate, magnesium acid phosphate, aluminum sulfate, ammonium polyphosphate, phosphoric acid, an activator and mixtures thereof. The resulting laminated structure composed of the base material, the coating and the magnesium phosphate cementitious material is also disclosed.

Abstract: A pre-reacted resistor paint is disclosed, wherein a base metal powder, such as SnO.sub.2 is coated with a resinate solution, such as Co and Mn resinates and fired in a reducing atmosphere to form a pre-reacted conductive powder for subsequent mixing with a glass frit and a screening agent to blend a pre-reacted resistive paint, for subsequent screening onto a substrate and firing in an inert atmosphere to form a base metal resistor therefrom. Two mixtures of resistive paint are disclosed. The first resistive paint exhibiting a sheet resistivity in the range from 5,000 through 20,000 ohms per square; and the second resistive paint exhibiting a sheet resistivity in the range from 50,000 through 300,000 ohms per square. The first and second resistive paints may be blended to provide a base metal resistive paint exhibiting a sheet resistivity in the range from 5,000 through 300,000 ohms per square, with a TCR within .+-.200 ppm/.degree.C.

Abstract: A thin film electroluminescent device is disclosed which includes an electroluminescent emitting layer comprising an alkaline-earth selenide, such as SrSe (strontium selenide) and calcium selenide (CaSe), or an alkaline-earth sulfide, such as CaS (calcium sulfide) and strontium sulfide (SrS), as the luminescent host material, and a lanthanoid rare-earth element as an activator, and a method of fabricating the same is also disclosed.

Abstract: A force imparting orthodontic appliance system is provided wherein the components thereof are formed from fiber reinforced composite material comprising a polymeric matrix and at least five percent of a reinforcing fiber embedded in the matrix.

Abstract: A running-surface plastic coating for skis which comprises a running surface forming a climbing aid and having a multiplicity of teeth which are aligned in the longitudinal direction of the ski and terminate towards the rear end of the ski in a pointed end capable of being bent upwards, said teeth being defined by two families of parallel running-surface cuts intersecting each other in the running surface, the individual families of cuts being inclined to a normal of the running surface in opposite directions wherein the running surface cuts at least substantially have the shape of circular segments and include an angle of at least 60.degree. with a running-surface normal, and that the relative spacing of the running-surface cuts is at most 1 mm.

Abstract: A magnetic recording medium in which a hexagonal crystalline system ferromagnetic powder having a specific surface area of 25 to 50 m.sup.2 /g is dispersed in a resinous binder is suitable for high-density recording which is low in noise and is excellent in orientation properties.

Abstract: Substrate composites, well adopted for the production of metallized printed circuits and facilely prepared by, e.g., papermaking procedures, include a central core layer comprising fibrous cellulosic material or flaked mica within a matrix of a thermosetting resin binder, said central core element having coextensively laminated to at least one of the face surfaces thereof, a lamina of a thermosetting resin comprising non-conductive metal oxide filler material distributed therethrough, and said metal oxide being borohydride reduceable and reactive to form unstable metal hydride intermediates.

Abstract: A sintered ceramic body has a surface layer containing yttrium silicate, cristobalite and silicon nitride, and mainly consists of silicon nitride. The silicon ceramic body is manufactured by preparing a composition containing a silicon nitride powder and an yttrium oxide powder, forming and sintering the composition, and heat-treating the sintered body in an oxidizing atmosphere. The ceramic body has a high mechanical strength over its entire surface and has little variation in mechanical strength.

Abstract: An artificial tooth root is divided into a tooth root body and a root holder. The material for the artificial tooth root body is selected in consideration of its strength. The outer surface of the root holder that is in contact with the alveolar bone is formed of a biologically activated material for providing strong adhesion between the root holder and the alveolar bone. An impact reducing material is provided between the artificial tooth root body and the root holder to reduce the impact force placed on the tooth root body so that the force applied to the alveolar bone portion is reduced.

Abstract: Performance characteristics for an X-ray intensifying screen are improved by use of an acrylonitrile/styrene copolymer composition as the protective topcoat. The resulting intensifying screen is well suited for use in automatic X-ray changer systems.