Abstract: A method of cleaning a dust filter includes applying a negative electrical potential to a first electrode in a first area of a dust filter and applying a positive electrical potential to a second electrode disposed in a second area of the dust filter, wherein a voltage differential between the first and second electrodes is sufficient to cause electrostatic movement of dust from the first area to the second area. Then, the method further includes applying a negative electrical potential to the second electrode and applying a positive electrical potential to a third electrode disposed in a third area of the dust filter, wherein a voltage differential between the second and third electrodes is sufficient to cause electrostatic movement of dust from the second area to the third area, and wherein the first, second and third areas are generally linearly arranged.

Abstract: A computer system includes a computer chassis housing a processor and having a dust filter disposed in an airflow pathway through the computer chassis. A plurality of electrodes is disposed across an area of the dust filter, and a voltage source is provided having a negative terminal and a positive terminal. A controller selectively couples a first subset of electrodes to the negative terminal and selectively couples a second subset of electrodes to the positive terminal, wherein a voltage differential between the first subset of electrodes and the second subset of electrodes is sufficient to cause electrostatic movement of dust from an area of the dust filter near the first subset of electrodes to an area of the dust filter near the second subset of electrodes.

Abstract: A one-piece sponge cleans and removes coating material from the bottom edge, inside and outside surface of a photoreceptor drum. The one-piece sponge has an inner sponge section and an outer sponge section, both with internal channels to remove solvent and dissolved coating material.

Abstract: An apparatus including: a tank with a closed base end and an open top end, and adapted to contain a coating formulation; and a receiver member with at least a cone shape, where the base of the cone is attached to the interior and to the base end of the tank and adapted to receive an article for coating.

Abstract: A one-piece sponge cleans and removes coating material from the bottom edge, inside and outside surface of a photoreceptor drum. The one-piece sponge has an inner sponge section and an outer sponge section, both with internal channels to remove solvent and dissolved coating material.

Abstract: An apparatus including: a tank with a closed base end and an open top end, and adapted to contain a coating formulation; and a receiver member with at least a cone shape, where the base of the cone is attached to the interior and to the base end of the tank and adapted to receive an article for coating.

Abstract: An apparatus including: a tank with a closed base end and an open top end, and adapted to contain a coating formulation; and a receiver member with at least a cone shape, where the base of the cone is attached to the interior and to the base end of the tank and adapted to receive an article for coating.

Abstract: An improved fuel valve for an air-vapor mixer device for the fuel supply system of an internal combustion engine with which it is in thermal contact is disclosed. The valve operates in a fuel metering orifice and is composed of an acetal copolymer resin having a high coefficient of expansion. When the valve is cool, the metering orifice provides a richer mixture of fuel to air for cold starting and idling. As the engine warms up, the fuel valve expands through thermal contact with the engine and as a result of its high coefficient of expansion decreases the effective size of the orifice to lean the mixture and thereby provide better fuel economy and reduced pollutants. For mid-range control the fuel valve has a section of generally frustoconical configuration provided with circumferential steps that lean out mid-range mixtures for average operating conditions and produce an optimal admixture of fuel and air.

Abstract: A monopulse spiral antenna system of the type having a minimum of three, interwound spiral arms for multimode, direction of arrival sensing, is disclosed in which the antenna arms are shaped and arranged in an overlapping configuration that allows the interarm impedance of the antenna to be adjusted, substantially independently of other electrical properties of the antenna, for matching of the antenna impedance of a mode forming network while preserving the broadband, directional capabilities of the antenna. Several different embodiments of the impedance adaptive antenna are disclosed including a preferred, eight-arm exponential spiral in which the arms are conductive strips transversely inclined relative to a plane formed by the spiral so that opposed and parallel surfaces of adjacent arm strips create a dominant interarm capacitance that in turn determines the overall input impedance of the antenna.

Abstract: To optimize antenna bandwidth and efficiency in broad-band antenna elements of the planar, multiarm spiral and log periodic types, a conically shaped ground plane characterized by progressively sized circumferential chokes, is arranged on a common axis with the axial center of the spiral or log periodic elements so that the electrical spacing between the excited regions of the log periodic of spiral elements and the ground plane maintains a constant one-quarter wavelength relationship. The progressively sized circumferential chokes on the ground plane cut off the flow of excessive radial currents along the ground plane surface to achieve an improved mix of excitation and reexcitation modes. In one embodiment, the circumferential chokes on the conical ground plane are partially shunted by shunting strips that electrically or capacitively bridge the choke walls to reestablish limited radial currents along the ground plane for sustaining certain desirable antenna modes.

Abstract: Protection of microwave antennas from incident irradiation from high power lasers is accomplished by placing a protective covering or radome over antenna elements to be protected. The radome is constructed such that it is substantially transparent to electromagnetic radiation in the microwave frequency range and at the same time substantially opaque to electromagnetic radiation in the laser frequency range. The radome is constructed of multilayers of a refractory ceramic material, such as boron nitride and beryllium oxide, spaced apart with the spaces evacuated. When the electromagnetic radiation from a high power laser strikes the radome of this invention, the opaqueness to the laser energy causes a conversion to heat energy which is then insulated from sensitive antenna elements by the evacuated spaces separating the refractory ceramic layers.