Abstract: A moldable dental composition for use in forming or repairing dental restorations composed of a mixture of high- and low-fusing temperature metal particles and a volatile binder, composed substantially or entirely of wax, with the binder having a concentration of between thirty (30%) to eighty percent (80%) by volume of the mixture. The average particle size of the high-fusing metal particles are above one micron, and preferably between four microns and eighty microns in size. The composition is heat treated at a temperature to melt the low-fusing temperature metal particles and to eliminate the binder, leaving a porous metal structure with a void volume above thirty percent (30%). The voids are filled using a filler material of metal or ceramic.

Abstract: An orthodontic appliance for intraorally distalizing teeth without patient compliance, comprising a pair of small complementary permanent magnetic elements, each having a coaxial hole for slidably mounting the magnets on a single common sectional wire, in an arrangement to repel one another, with each element having a protective coating to prevent corrosion and leaching. Additional means are provided for urging the magnetic elements along the sectional wire into predetermined proximity as the molar tooth or teeth distalize. This arrangement avoids undesirable eccentric magnetic movement, maximizes control of the repelling horizontal magnetic forces, and maintains a substantially constant distalizing force without the need for constant readjustment.

Abstract: A moldable dental composition for use in forming or repairing dental restorations composed of a mixture of high- and low-fusing temperature metal particles, finely divided carbonaceous particles, preferably of activated carbon, and a volatile binder in a concentration, such that upon heat treatment at a temperature below the melting temperature of the high-fusing temperature metal particles but sufficient to melt the low-fusing temperature metal particles and binder, a porous metal structure is formed having a capillary network of voids and a high void volume. The voids are filled using a filler material of metal or ceramic.

Abstract: A positive displacement piston flow meter for measuring air flow comprising a hollow flowtube, preferably arranged in a vertical orientation, having a movable piston disposed in the flowtube for movement between a starting position, preferably at the bottom end of the piston stroke, and an elevated position at the top end of the piston stroke. The piston is reciprocated by means of a pressure relief control valve assembly which controls the ascent and descent of the piston. The piston is physically connected to the pressure relief control valve assembly by means of a flexible string, which causes the piston to automatically close the valve assembly for automatic operation on reaching the bottom end of the piston stroke and to reverse direction.

Abstract: The optical light guide of the present invention is composed of a solid, transparent material selected from the class consisting of glass, acrylic, polystyrene, and polycarbonate. The light guide has a head, a tapered section and a curved section. The head has a light-receiving, concave surface geometry at the proximal end of the light guide.

Abstract: The present invention relates to a method for forming a uniform protective outer coating of pyrolytic graphite on a graphite chuck which is used for supporting a started filament in the manufacture of carbon free polycrystalline silicon.

Abstract: A process for the continuous analysis of trace contaminants in a process gas of O.sub.2, N, Ar or H.sub.2. A sample of the process gas is passed through a plurality of analyzers with each dedicated to detect the presence of a predetermined trace contaminant and to provide an output signal corresponding to the level of trace impurity detected. A status signal is generated representative of preselected parameters of analyzer operation. The output and status signals are converted by a computer into data values. A rule based program provides a problem analysis to identify distinct problems based on the examination of the data values. The rule based program is executed by a separate command program which matches the problems identified by the rule based program with remedial actions to remedy erroneous conditions of analysis.

Abstract: A continuous evaporation process for drying water-wet waste solids and sludges, using a paraffin oil solvent, until the waste is dried to a near-zero wastewater product, without experiencing sticky solids. The invention involves (1) mixing the input solids or sludges with a paraffin oil solvent, (2) feeding the mixture into two or more stages of evaporation in parallel to evaporate some of the water present in the input solids or sludges and to extract some of the indigenous solvent-soluble compounds from the solids, (3) feeding the slurry from the parallel stages of evaporation to one or more final evaporation stages in series, and (4) feeding the slurry from the final stages of evaporation to a centrifuge or other device for separating most of the solvent from the solids.

Abstract: A fluid flow measuring device having a positive displacement piston in a precise bore glass flowtube, with flexible diaphragms at opposite ends of the flowtube, to seal the flowtube from the ambient environment. The flowtube is filled with a pure fluid or gas for uncontaminated operation of the piston. Movement of the piston within the sealed flowtube is controlled by controlling the movement of each diaphragm. The diaphragms are supported in a housing connected to each opposite end of the flowtube, with a plenum chamber in communication with each diaphragm, and with means for the ingress and egress of the fluid under flow measurement with the plenum chamber.

Abstract: A method of resistance heating using a graphite container having a graphite body and a pyrolytic boron nitride coating in which a metal charge of predetermined weight is deposited over the coating and the container is heated by the application of a variable source of electrical power to cause the metal charge to fully evaporate in a short interval of time of less than two minutes with the heat cycle controlled to provide a cool down period in each cycle of applied power and with a new metal charge introduced upon completion of each heat cycle in a semi-continuous fashion.

Abstract: The composition of the present invention is composed of finely divided solid refractory material suspended in a nonaqueous liquid slip composition. The nonaqueous liquid slip composition consists essentially of a deflocculent composed of a vinyl chloride and vinyl acetate resin dissolved in an organic solvent. The composition may be slip cast or cold formed into a low density article which is then sintered into a dense product.

Abstract: A moldable dental composition for use in forming or repairing dental restorations composed of a mixture of high- and low-fusing temperature metal particles and a wax in a concentration of between thirty to eighty percent by volume of the mixture. The average particle size of the metal particles are above one micron, with the high-fusing temperature metal particles at least twice the size of the low-fusing metal particles. The composition is heat treated at a temperature to melt the low-fusing temperature metal particles and to eliminate the wax, leaving a porous metal structure with a void volume above thirty percent. The voids are filled using a filler material of metal or ceramic.

Abstract: A Group IIA metal-Group IIIA metal-silicon substantially homogeneous liquid alkoxide is prepared from a reaction mixture of a Group IIA metal, a Group IIIA metal, a silicon tetraalkoxide, and a liquid defined by the formula ROR' where R is an alkyl group and R' is hydrogen or an alkyl group. The alkoxide can then be hydrolyzed, azeotropically distilled, dried, milled, and calcined to produce a ceramic powder. Advantageously, the ceramic powder can be compacted and sintered at relatively low temperatures which enable it to be used in electrical applications where high sintering temperatures would be deleterious.

Abstract: A Group IIA metal-Group IIIA metal-silicon substantially homogeneous liquid alkoxide is prepared from a reaction mixture of a Group IIA metal, a Group IIIA metal, a silicon tetraalkoxide, and a liquid defined by the formula ROR' where R is an alkyl group and R' is hydrogen or an alkyl group. The alkoxide can then be hydrolyzed, azeotropically distilled, dried, milled, and calcined to produce a ceramic powder. Advantageously, the ceramic powder can be compacted and sintered at relatively low temperatures which enable it to be used in electrical applications where high sintering temperatures would be deleterious.

Abstract: An expandable seal of flexible graphite composed of a prestressed flexible graphite composition of a mixture of flexible graphite and a thermoplastic material having a preselected melting temperature corresponding to the temperature at which the seal is to commence expansion. The flexible graphite composition is prestressed under a compressive force and a temperature such that the thermoplastic material is in a plastic state.

Abstract: The electric furnace operating cycle time is substantially reduced by directing water into the porous pack of carbonaceous material surrounding the electrodes at a water rate adjusted to maximize vaporization of water into steam within the porous pack while allowing the steam to escape without contacting the electrodes.

Abstract: System for controlling the positions of each of the three electrodes of a three phase electric furnace to maintain optimum real power delivered to the furnace in the event of electrode short circuiting or arc extinction due to scrap movement in the furnace. The system includes means for determining the magnitude of arc voltage and arc current and means to change the position of selected electrodes when either arc voltage or arc current is determined to be zero.

Abstract: A process for isostatic molding permitting density of the product being molded to be measured and controlled in-situ. The process is carried out by weighing the mold assembly in the fluid medium within the pressure vessel inclusive and exclusive of the powder charge with the latter weight determined by the difference between the weight of the mold assembly outside of the pressure vessel and its buoyant force in the pressure vessel.

Abstract: A system for assisting the implementation of an environmental compliance program using microcomputer hardware and software to automatically revise the test sampling frequency of potentially hazardous substances based on estimates of risk of exposure derived from sample data.

Abstract: A ternary brazing alloy for carbon or graphite consisting essentially of 0.5-10 wt % titanium, 10 to 50 wt % tin, balance copper.