Abstract: A laser markable composite material which when so marked retains good color contrast after heat aging. The material comprises polytetrafluoroethylene resin, photosensitive filler material and an extrusion aid. The photosensitive material is preferably a metal oxide and has a larger mean particle size than typical pigments. Also disclosed is a sequence of milling, mixing and blending steps which forms the desired composite material.

Abstract: Process for producing novel coated nickel and/or cobalt superalloy bodies having increased resistance to oxidation, corrosion and thermal fatigue at high temperatures. The process comprises applying a thin layer of a platinum-group metal, siliciding and heating to an elevated temperature to diffuse and integrate the silicided platinum-group metal into the surface of the superalloy body. Then the superalloy body is exposed to a diffusion powder composition containing sources of aluminum or aluminum/chromium metals and heated in a hydrogen or inert gas atmosphere to an elevated temperature to codeposit and diffuse aluminum or aluminum and chromium into the silicided platinum-group metal-treated surface. Finally, the superalloy body is heated to its solvus temperature to form a ductile surface having an outer zone comprising a platinum-group metal aluminide, optionally ductilized by the solutioning therein of beta chromium.

Abstract: An igniter and fuel atomizer nozzle assembly in a gas turbine engine includes an igniter in which a fuel conduit is positioned in a passageway in the igniter between its housing and its electrode for discharging atomized start up fuel from the end of the igniter housing closely proximate to the ignition spark generated by the electrode.

Abstract: The fuel pumping system for delivering fuel to an engine includes a fuel transfer circuit for directing fuel from a fuel supply tank to the engine, a fuel boost pump, a main fuel pump and an accumulator device positioned along the transfer circuit between the boost pump and the engine for accumulating fuel and vapor so as to provide a reserve supply of fuel to the engine while minimizing the amount of undissolved vapor delivered to the engine. The system includes a return passage communicating, at one end, with the accumulator and at an opposite end with the fuel transfer circuit upstream of the boost pump for directing fuel and vapor from the accumulator into the transfer circuit.

Abstract: An improved flowing arch expansion joint includes a fiberglass body layer having an overlapping longitudinal seam that are bonded together by a layer of heat flowable fluoropolymer material. The radial expansion strength of the joint is enhanced by a supplemental peripheral reinforcing strip extending over less than the entire axial length of the joint, in the area of the maximum diameter portion, only. The peripheral reinforcing strip is formed by a winding process in which tire cord-based strip material is wound at a laying angle as close as possible to ninety degrees relative to the axis of the joint.

Abstract: Process for producing novel nickel superalloy bodies having increased resistance of to oxidation and corrosion at high temperatures. The process comprises applying a thin layer of a platinum-group metal and heating to an elevated temperature to diffuse or integrate the platinum-group metal into the surface of the metal superalloy. Then the superalloy body is packed into a container filled with a diffusion powder composition containing sources of aluminum and chromium metals and heated in a hydrogen gas atmosphere to an elevated temperature to codeposit and diffuse aluminum and chromium into the platinum-group metal-treated surface. Finally, the superalloy body is removed from the diffusion coating container and heated to the solvus temperature to form a ductile surface having an outer zone microstructure comprising a normally brittle PtAl.sub.2 which has been ductilized by the solutioning therein of beta chromium. This ductilized PtAl.sub.

Abstract: A labyrinth type seal assembly having one or more controlled porosity elements retained in the labyrinth pathway between relatively rotatable seal elements. Preferably the controlled porosity elements are formed of open celled foam material such as polyurethane. The controlled porosity elements assist in preventing the ingress of contaminating solid or liquid materials, the loss of sealed materials and the flooding or overloading of drain ports.

Abstract: A friction material and process of forming a friction material embodies a slurry of aramid, acrylic and carbon fibers, together with kaolin clay and aluminum oxide used as fillers in a phenolic resin binder. The matrix formed by the fibers entraps a relatively large quantity of carbon particles. The carbon particles comprise more than forty or fifty percent of the weight of the material. During the process of formation, the slurry is de-watered to reduce moisture content to the order of two percent before the resin binder is cured under heat and pressure.

Abstract: A straight stream nozzle for use in directing a liquid stream at a solid surface with greater force at greater distances. The nozzle has concentric arrays of ports around a solid center. As liquid is forced through the ports, that liquid passing through the outer array of ports shields that passing through the inner array and the solid nozzle center creates a hollow center in the liquid stream which tends to promote cohesion of the inner array of streams into a single more highly concentrated stream which produces high impact at a substantial distance.

Abstract: An identifying shield for an electronic instrument housing is formed of elastically stretchable and deformable material. The shield elastically surrounds the periphery of the instrument housing adjacent to its front panel surface, and defines a central opening that exposes the front panel for viewing by an operator. A first portion of the shield defines the central opening overlying the front panel of the instrument housing, and a second portion extends rearwardly from the first portion defining a peripheral band that engages the periphery of the case along its sidewalls adjacent to the front panel. An inwardly extending flange projects from the rearward edges of the peripheral band to enhance frictional engagement with the underlying sidewall surfaces of the instrument housing.

Abstract: A meter measures a voltage across a quasi-diode, the voltage caused by a current flowing through a resistance which changes substantially exponentially with changes in a medium being sensed. The meter comprises a logarithmic current measuring circuit coupled to the resistance to provide a measurement output that is a logarithmic function of the current flowing through the sensing resistance. A switchable current source is controlled by a switching circuit to repetitively output first and second current values. A reference logarithmic circuit is connected to the switchable current source and is physically coupled to the logarithmic measuring circuit so as to be maintained at a substantially equal temperature value. The logarithmic reference circuit manifests a first voltage in response to the first current value and a second voltage in response to the second current value, both voltage values dependent upon the temperature of the logarithmic reference circuit.

Abstract: A fail-safe throttle positioning device is disclosed for an engine induction system. A throttle body is provided having a fluid passage. A movable throttle valve is disposed within the fluid passage for at least idle speed control. An actuator mechanism is connected to the throttle valve for operably moving the throttle valve between a minimum fluid flow position and a maximum fluid flow position. A fail-safe mechanism urges the throttle valve toward an intermediate position between the minimum and maximum fluid flow positions to prevent inoperability of the engine during failure of the actuator mechanism.

Abstract: A unified fuel pump assembly combines a vane-type pump and a booster stage for the inlet of the vane-type pump, in a unitary structure to substantially reduce "windage" losses caused by relatively moving parts. The unified structure also includes an electric motor subassembly to provide motive power, and a liquid ring pump, which helps to process air bubbles through the fuel pump, is coupled to the electric motor rotor to further avoid "windage" losses. The vane type pump relies on the use of a central shaft capable of having a substantially uniform and relatively large diameter from end to end.

Abstract: A position housing assembly, for a generally cylindrical infra-red thermocouple sensor of the type having a sensing face at one end and one or more electrical conductors extending from the other end, includes a cylindrical housing having a central bore for telescopically receiving a sensor. A conical reflective surface, at one end of the housing, concentrates infra-red rays toward the face of the sensor; the reflective surface may be integral with the housing or it may be carried by a separable adapter. A separable handle attaches to the housing, and extends into the housing wall for guiding conductors from a sensor to the exterior of the housing. A set screw on the housing clamps the sensor within the central bore. Adjustable positioning legs extend axially from the housing to position it relative to a test surface. In one embodiment the legs are attached to a moveable positioning bracket, while in another, the legs slide within axial bores integrally formed in the housing.

Abstract: The automated catalytic reduction system for an engine exhaust stream includes an oxidation catalyst spaced from a selective catalytic reduction catalyst for reducing nitrogen oxides. A reducing agent is introduced into the space between the two catalysts and is controlled in volume by a volume control valve. Transducers connected to the engine provide real time engine operating parameter signals to a processor which has stored map data indicating instantaneous nitrogen oxide values for various engine loads. The processor selects an instantaneous nitrogen oxide value in response to the engine condition signals and uses this value to calculate a setpoint value for comparison with the flow volume of the reducing agent. Any difference resulting from this comparison causes the processor to operate the control valve to equalize the flow volume with the setpoint value.

Abstract: Collapsible box-like cartons of the type constructed to fold flat for storage and to be unfolded to form a rigid carton for shipping purposes are provided with secondary hinge and removable sections which thereby enable such cartons to be transformed from their first substantially rectangular geometric shape in which they are used as shipping cartons to a second useable shape so that they can be recycled for other purposes.