Abstract: An orifice plate for a glass ribbon machine has an orifice provided with a side wall having a continuously variable angle. When used for making envelopes for incandescent lamps, the plate provides stronger bulbs.

Abstract: A an europium doped yttrium oxide red phosphor in a water base phosphor coating suspension is checked for degraded phosphor by (a) centrifuging the suspension, (b) separating an aqueous portion from a solids portion, (c) exposing a surface portion of said solids to UV radiation at 254 nm or 365 nm, (d) observing the presence or absence of fluorescence from said top layer of solids wherein the absence of fluorescence is indicative of a degraded phosphor.

Abstract: Apparatus for forming a groove in a glass tube without contacting the glass tube in the groove region. The apparatus includes a pair of chucks for holding opposite ends of the glass tube. The chucks are coupled to a motor for rotating the glass tube about its longitudinal axis. The apparatus further includes one or more torches for noncontact heating of the groove region of the glass tube sufficiently to soften the glass tube in the groove region. The chucks which hold the glass tube are axially movable for stretching and then compressing the glass tube along its longitudinal axis, when the glass tube has been softened in the groove area. The chucks are rotated during heating, stretching and compressing of the glass tube.

Abstract: In the manufacture of ammonium paratungstate, sulfide is added to a tungsten-containing solution in order to precipitate molybdenum sulfide. Volatiles, including sulfides, evolved during this process are collected in a caustic scrubbing solution. The sulfide values in the caustic scrubbing solution may be reused to precipitate molybdenum sulfide by first treating the caustic scrubbing solution with alkaline earth chloride or sulfate to precipitate out alkaline earth carbonate.

Abstract: An orifice plate for a glass ribbon machine has an orifice provided with a side wall having a continuously variable angle. When used for making envelopes for incandescent lamps, the plate provides stronger bulbs.

Abstract: An automotive headlamp socket includes an interior floor having a wall projecting therefrom. The wall contains a plurality of T-shaped slots which frictionally accept electrical contacts.

Abstract: A fluorescent lamp phosphor product is recovered from a degraded aqueous suspension by treating a separated solids portion of the suspension with nitric acid to solubilize a decomposed portion of a rare earth activated yttrium oxide phosphor and form a remaining mixture of phosphors which may be reconstituted to a fluorescent lamp phosphor product suitable for use in a lamp.

Abstract: A lamp bridge may be formed from a siliceous hollow tube positioned between and melted to bridge supports. The hollow tube melts more quickly, and more completely, and therefore bonds stress free and more durable to the bridge supports.

Abstract: A metal halide high intensity discharge lamp including a carbon monoxide additive in the arc tube fill to improve lumen maintenance is provided. The metal halide discharge lamp of the present invention comprises: an outer sealed glass envelope; a pair of electrical conductors sealed into and passing through the glass envelope; an arc tube disposed within the outer glass envelope, the arc tube including a pair of spaced electrodes therein with the electrodes being electrically connected to the electrical conductors such that one electrode is electrically connected to one electrical conductor; a chemical fill disposed within the arc tube, the chemical fill comprising mercury, metal halide additives, carbon monoxide, and a starting gas; and a support structure disposed within the outer glass envelope to support the arc tube therein.

Abstract: An improved lamp socket, and method of fabricating same, including a housing having a cavity into which a plurality of contacts are inserted. The contacts function to mechanically retain the base of a lamp in place and to electrically connect the socket wiring to the contacts of such lamp.

Abstract: A lanthanum cerium terbium gadolinium phosphate phosphor has the composition La.sub.1-x-y-z Ce.sub.x Tb.sub.y Gd.sub.z PO.sub.4, where x=0.2 to 0.45, y=0.127 to 0.137, and z=0.001 to 0.1. The phosphor has improved brightness and/or maintenance over a lanthanum cerium terbium phosphate phosphor without gadolinium. The phosphor can be prepared by reacting a lanthanum cerium terbium gadolinium oxide with boron phosphate in the presence of a flux forming compound containing lithium in an inert or reducing atmosphere.

Abstract: A method for producing pure cobalt metal powder involves the removal of divalent cationic impurities from a trivalent hexamine cobalt chloride solution. This solution is then decomposed to an insoluble cobalt oxide-containing material, from which pure cobalt metal powder is obtained through a chemical reduction process.

Abstract: A telephone network interface device comprises a base structure, a protector assembly disposed within the base structure and a cover on the base structure. The device also includes a telephone jack and terminals to which a telephone subscriber's wiring can be connected. The combination of the base structure, cover, telephone jack and terminals comprise a stand-alone unit which can be mounted in a variety of enclosures when installed at a telephone subscriber's premises.

Abstract: A source of red light includes a double-bore capillary tube having a pair of ends and a convoluted shape. A pair of electrodes is located at one end of the capillary tube and disposed within respective bores. An ionizable medium is enclosed within the capillary tube and includes neon at a pressure from about 300 to 600 torr. When energized, the ionizable medium generates an arc discharge between the electrodes consisting primarily of radiation in the range of from 590 to 670 nanometers. An outer jacket of vitreous material may surround the capillary tube and contain an inert gas (e.g., nitrogen) at a predetermined pressure.

Abstract: A method for eliminating carbonaceous contaminants and preventing the hydration/solubilization of the alumina protective coating of a phosphor is described. The method involves the heating a fluidized alumina coated phosphor in a fluidized bed at a temperature and for a period of time sufficient to preclude adversely affecting the protective oxide coating on the phosphor during subsequent water-based suspension processing without detrimentally altering the phosphor. After heating the fluidized phosphor is cooled and then added to a water-based suspension. The conditions for treating a manganese activated zinc silicate phosphor having a protective alumina coating are heating the fluidized phosphor at a temperature between about 700.degree. C. and about 850.degree. C. for a period of time from about 15 minutes to about 20 hours.A fluorescent lamp containing the phosphor prepared by the above described method is also described.

Abstract: An electric circuit for glow discharge lamp which regulates lamp output according to changing environmental conditions includes a power lamp circuit electrically connected between an anode lead-in wire and a cathode to create a lamp voltage, a filament power circuit electrically connected to a pair of cathode lamp filament lead-in wires to create a filament voltage whereby said lamp voltage decreases with an increasing filament voltage due to lamp characteristics, and a sensing and control circuit for adjusting the filament voltage in accordance with changing environmental conditions for maintaining lamp voltage at a predetermined constant value.

Abstract: A high pressure sodium lamp having a fill within an elongated arc tube comprising an inert starting gas, mercury and sodium wherein said mercury and sodium being are in an amount less than two milligrams per cubic centimeter of said volume of the interior of the arc tube wherein the weight ratio of sodium to mercury is less than 1 to 20 whereby the lamp is saturated with sodium and unsaturated with mercury at said predetermined nominal output voltage and does not extinguish at an input voltage exceeding about 90 percent of said rated voltage.

Abstract: An arrangement includes a network for connection between an AC power supply and the input of a DC power supply containing rectifiers and a filter capacitor. The network forms a third order, damped low-pass filter that waveshapes the AC input current so as to either reduce or remove the magnitude of harmonics which primarily cause distortion of the input current waveform. In a preferred embodiment, the waveshaping network includes an inductor connected in series with the input of the DC power supply. A series combination of a damping resistor and a first capacitor is connected in parallel with the series inductor. A second capacitor is connected in shunt with the input terminals of the DC power supply. The waveshaping network increases the power factor and lowers the total harmonic distortion the input of the DC power supply presents to the AC power supply.

Abstract: An arrangement includes a network for connection between an AC power supply and the input of a DC power supply containing rectifiers and a filter capacitor. The network forms a fourth order, damped lowpass filter that waveshapes the AC input current so as to either reduce or remove the magnitude of harmonics which primarily cause distortion of the input current waveform. In one embodiment, the waveshaping network includes a tapped inductor connected in series with the input of the DC power supply. A series combination of a damping resistor and a first capacitor is connected in parallel with the series inductor. One end of a second capacitor is connected to the tap of the inductor. The waveshaping network increases the power factor and lowers the total harmonic distortion the input of the DC power supply presents to the AC power supply.

Abstract: A method and apparatus which prevent mercury and fill gas loss in capacitively coupled electrodeless lamps operated at low frequencies (below 100 MHz). The lamp includes a lamp envelope with an inner coating of phosphor. Outer electrodes coupled to a radio frequency source are positioned around the outer surface of the lamp envelope. The lamp contains a fill gas (e.g. mercury and argon) which forms a plasma causing UV radiation which excites the phosphor. Mercury loss is prevented by providing a pair of inner conductors aligned with the outer conductors but electrically insulated therefrom. The inner conductors prevent the mercury and fill gas ions from embedding themselves in the lamp envelope.