Abstract: A device for carrying out an analytical determination which comprises an assay cassette and a transport body which is adapted for location in the assay cassette, the assay cassette having a plurality of discrete reagent chambers which are separated from one another by a separation arrangement which, in use, is ruptured or opened by the transport body. An assay cassette is also described which includes a signal detection chamber that is separated from the final reagent chamber by a separation arrangement which, in use, is ruptured or opened by the transport body.

Abstract: A high frequency power transformer having a multi-element magnetic shield conforming to the surface of the structure including provisions for specific features of the magnetic circuit and winding assembly. The winding is disposed on one side of a four-sided magnetic circuit and is partially surrounded by a close fitting electrically continuous loop. The winding assembly includes an area having a higher electrostatic field and is surrounded by a second electrically continuous loop which is spaced apart from the winding assembly, providing significant electrostatic shielding and air movement over the winding assembly while avoiding arcing between the shield and the winding assembly due to the high electrostatic field.

Abstract: A power supply operable from power mains voltages generally within two voltage ranges according to which the power supply automatically switches between a full wave and a voltage doubler. Furthermore, the power supply provides automatic mode selection on a cycle-by-cycle basis, sensing the mains signal during an initial portion of the mains input cycle and causing the power supply to select a mode of operation during that cycle. Thus, the present invention provides rapid response to changing mains voltages. Moreover, the voltage doubler mode is inhibited during the initial power up period, providing a margin of safety when initially energized or when connected to rapidly changing mains voltages.

Abstract: A press felt for use in a papermaking machine. The press felt includes a base fabric having a batt of fibers secured to at least an upper surface of the base fabric, and preferably to both sides of the base fabric. The base fabric has a plurality of noncircular synthetic monofilament warp or machine direction ends and a plurality of shute or machine direction ends interwoven therewith according to a predetermined weave pattern.

Abstract: A deflection circuit for providing magnetic deflection of a cathode ray tube including resonant retrace, including circuitry to minimize the variations in intensity of the image at the beginning of the deflection period after the end of the retrace period, which variation may be caused by parasitic resonances excited by slow turn on of the flyback deflection clamping diode. The circuit enables the flyback clamping diode to begin conduction prior to the end of the retrace period so that the deflection clamping diode is substantially fully conducting and the voltage across the magnetic deflection coil is substantially constant at the end of the retrace period. Thus, a uniform transition is made from retrace to linear deflection and screen intensity variations are avoided.

Abstract: A method and apparatus are disclosed for efficiently cutting food items, such as potatoes, into helical strips. The food items are provided seriatim to the cutting assembly from a conveyor system fed by a trough shaker or other singulator device. Food items on the conveyor are aligned longitudinally and are then impaled on small spikes protruding from the conveyor so that they maintain the longitudinal orientation during their travel to a feed roller portion of the system. The feed rollers firmly grip the food items by their peripheries and advance them into the rotary cutting assembly. This assembly includes a helically shaped cutting member defining at a leading edge thereof a slicing blade and supporting on its front surface a plurality of perpendicularly extending scoring blades. The helically shaped cutting member is mounted at its periphery by being threadedly received in a helical thread cut in an annular holder.

Abstract: A press felt for use in a papermaking machine. The press felt includes a base fabric produced of polybutylene terephthalate having a batt of chlorine resistant fibers secured to at least an upper surface of the base fabric, and preferably to both sides of the base fabric. The base fabric preferably has a plurality of noncircular monofilament warp or machine direction ends and a plurality of round monofilament shute or machine direction ends interwoven therewith according to a predetermined weave pattern.

Abstract: Dense tungsten ingots are prepared by hot isostatically pressing at a temperature of about 1500.degree. to about 1700.degree. C. and a pressure of about 20 to about 30 ksi for about 2 to about 3 hours a refractory container comprising a green tungsten metal compact in contact with a dopant, the tungsten metal of the compact being formed prior to contact with the dopant; the dopant being a material which is insoluble in tungsten and contains molecules having atomic radii greater than the atomic radius of tungsten by at least about 15%.

Abstract: A method and composition employing microencapsulated thickeners for providing controlled thickening of thermosetting resins, including sheet molding compositions.

Abstract: An image recorder for providing a CRT image and apparatus to store the image on a film disposed on a film plane. The relative position, intensity and focus parameters of the image are measured during an initial startup of the image recorder, wherein the position, intensity and focus parameters of the CRT and the image thereon are automatically aligned to assure enhanced performance. The apparatus according to the present invention provides an alignment mask disposed in the CRT plane, and the CRT parameters are measured by observation of the light collected through the alignment mask from the CRT and processing the corresponding light intensity signals. The light sensing device provides a signal which is processed typically by a microprocessor controlled geometry engine to derive a set of correction data which is based on a prototype array of initialized data values. The correction data provide signals which are combined with uncorrected CRT deflection signals to provide a corrected signal.

Abstract: The present invention relates to a novel method for conducting phase transfer catalysis in a multiphase reaction system wherein the different phases are separated by a membrane permeable to the phase transfer catalyst and its various reaction complexes. The invention also relates to membranes and a membrane-containing apparatus useful in carrying out phase transfer catalysis.

Abstract: A technique including an apparatus for injection molding fiber-reinforced thermoset plastic articles is disclosed. The technique includes forming a mixture of short lengths of reinforcing fibers with a thermosetting resin in a predetermined fiber-to-resin ratio and introducing the mixture to an injection molding cylinder. The volume of mixture introduced is at least a multiple of two of the volume of the mold chamber so that the injection plunger traverses the intersection between the molding cylinder and a stuffer cylinder a single time for a multiplicity of molding shots to minimize fiber breakage and balling. The injection plunger is adapted to precompact the mixture by being forced forward until a predetermined high pressure is sensed, indicating a hydraulically locked condition of the plunger wherein substantially all entrapped gases have been expressed from the mixture and there exists no substantial forward movement of the plunger.

Abstract: A high-performance deflection yoke providing deflection of an electron beam in a CRT at high rates at high deflection angles. The high-performance deflection yoke includes a heat sink contacting the deflection yoke coils to remove the heat produced in the deflection yoke due to core losses and heat produced in the deflection coils due to resistive losses. The heat sink minimizes induced eddy currents and comprises fine wire elements, interwoven and/or in juxtaposition with the deflection coils, wherein the heat created within and picked up by the deflection coils is transferred to the heat sink for dissipation. By minimizing power lost in the heat sink due to inductive heating of the metallic components thereof, the heat sink according to the present invention provides a high-performance deflection yoke having low inductance, high power performance not heretofore practically realizable.

Abstract: A technique directed to a process for injection molding fiber-reinforced thermoset plastic articles is disclosed. The technique includes forming a mixture of short lengths of reinforcing fibers with a thermosetting resin in a predetermined fiber-to-resin ratio and introducing the mixture to an injection molding cylinder. The volume of mixture introduced is at least a multiple of two of the volume of the mold chamber so that the injection plunger traverses the intersection between the molding cylinder and a stuffer cylinder a single time for a multiplicity of molding shots to minimize fiber breakage and balling. The injection plunger is adapted to precompact the mixture by being forced forward until a predetermined high pressure is sensed, indicating a hydraulically locked condition of the plunger wherein substantially all entrapped gases have been expressed from the mixture and there exists no substantial forward movement of the plunger.

Abstract: Jamming caused by absorbent members in sponge core barrels or loss of coring information caused by oil wipes in oil field boreholes in which sponge core coring tools are disposed can be avoided by employing a method and tool wherein the absorbent member is formed in placed in contact about the core after the has been cut and disposed within the inner tube. In the illustrated embodiment, a liquid foam is catalytically formed from two constituent parts. The constituent parts are hydraulically forced from longitudinal chambers defined within the inner tube walls into an area in the throat of the bit where the parts meet and exothermically generate a liquid foam. The liquid foam rises into a plurality of longitudinal open chambers defined within the inner tube. Each of the open chambers has a longitudinal slot defined therethrough which communicates the chamber with the axial bore in which the core is disposed.

Abstract: An axial bore is defined throughout the hydraulic lift inner barrel. This axial bore is communicated with the interior of the inner tube thereby allowing the interior of the inner tube to be flushed prior to initiation of the coring operation. When the coring operation is begun, flow of drilling fluid to the interior of the inner tube is prevented by allowing a ball dropped within the drill string to seat within a plug through which the communicating axial bore is defined. Once the flow of drilling fluid to the interior of the inner tube is stopped, the coring operation can begin. After the coring operation is completed, a second ball is dropped and allowed to seat within an inner mandrel through which the axial bore of the coring tool is also defined. Once the axial bore of the inner mandrel is closed, drilling fluid is forced into an expansion chamber within a telescopic piston disposed circumferentially outside of the inner mandrel. The piston is connected to the inner tube.

Abstract: A seal for use between two relatively-rotatable parts includes a sealing member of fluorine resin having a side which terminates in an edge and which has a plurality of recesses adjacent to and disposed about the edge. Each groove is in the form of a quadrilateral with two opposite sides substantially parallel to the edge, one being longer than, and closer to the edge than, the other, and each of the other two sides being inclined at an acute angle to the longer of the two parallel sides. In use the edge and at least part of the side adjacent the edge are engageable with one of the two relatively-rotatable parts.

Abstract: A core spring type core catcher and a full closure core catcher are completely concealed from the core within a coring tool. The full closure catcher is reliably actuated to assume a closed configuration without dependence upon gravity or an interference diametrical fit with the core by use of a cam ring which is longitudinally displaced downwardly within the core barrel by a preloaded compression spring. The full closure core catcher is comprised of a plurality of flapper valves circumferentially disposed outside of the inner tube and concealed by the inner tube or a terminal extension of the inner tube. Disposed above the plurality of flapper valves, and also circumferentially disposed outside of and concentric with the inner tube is a cam ring. Similarly circumferentially disposed outside of and concentric with the inner tube is a preloaded coil compression spring bearing against the cam ring. The cam ring in turn is in sliding contact with a rear surface of each one of the plurality of flapper valves.

Abstract: A fragmented or unconsolidated core can be cut and retained within a coring tool without substantial disturbance of the core by the use of a shrouded core catcher. A core catcher is concentrically disposed within the coring tool and outside of a smooth, cylindrical sleeve telescopically disposed inside of the core catcher. The core catcher in turn is coupled to a lower assembly which can be selectively longitudinally fixed within the coring tool, but which is otherwise temporarily coupled to the sleeve. As the sleeve is longitudinally pulled upward after the completion of the coring operation, the lower assembly becomes longitudinally fixed within the coring tool and the sleeve, which heretofore has fully covered and concealed the core catcher, begins to be withdrawn from the core catcher, leaving it unconcealed. Ultimately, the core catcher is at least partially uncovered, thereby permitting activation and contact between the core catcher and the core disposed within the coring tool.