Load Device And Transformer Patents (Class 315/70)
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Patent number: 6911777Abstract: A clamp-on isolation transformer for an airfield lighting fixture in an airfield lighting system includes a first portion configured to receive a portion of a primary conductor of a primary current loop and a second portion configured to receive another portion of the primary conductor of the primary current loop at a location opposed to the location of the first portion. An attachment mechanism is configured to attach the first portion to the second portion such that the first and second portions surround the primary conductor. A winding is coupled to the first portion and is configured to be attached to an airfield lighting fixture.Type: GrantFiled: August 14, 2003Date of Patent: June 28, 2005Assignee: Cooper Industries, Inc.Inventors: James M. Mitsch, Daniel A. That
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Patent number: 6856095Abstract: This invention provides a magnetron high frequency device which includes: a filtering inductor coupled to a positive end of a direct current power supply; a central tap transformer having a central tap end, a first end and a second end; a filtering capacitor; a first switch which is connected in series to the second end of the central tap transformer and connected to a negative end of the direct current power supply; an in-series circuit having a second switch and a second capacitor and coupled to the central tap transformer; a first capacitor connected in-series with the central tap transformer and connected in parallel with the first switch; a rectifying device coupled to a secondary winding of the central tap transformer; and a magnetron coupled to the rectifying device. The first capacitor, the second capacitor and the central tap transformer forms a resonant circuit.Type: GrantFiled: July 1, 2003Date of Patent: February 15, 2005Assignee: Delta Electronics, Inc.Inventors: JianHong Zeng, XingKuan Guo, JianPing Ying
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Patent number: 6856094Abstract: A low voltage lamp is disclosed and claimed. The low voltage lamp includes a low voltage lamp switch having a first pole permanently connected to a remote source of electric power; a second pole permanently connected to a light; and a movable switch element permanently connected to the first pole and selectively movable into and out of electrical connection with the second pole. In the illustrated embodiment of the invention, the movable switch element includes a flexible cable having a first end connected to the first pole, and an electrically conductive ball mounted to the cable free end. The second pole here comprises a cup adapted to receive and electrically connect to a ball, and the second pole cup is electrically connected to a light.Type: GrantFiled: January 31, 2003Date of Patent: February 15, 2005Assignee: Tensor CorporationInventor: Roger Sherman
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Patent number: 6580228Abstract: A lamp using solid-state light emitting sources is configured to be used in a conventional socket. The lamp includes a flexible substrate on which are mounted a plurality of light emitting sources, such as light emitting diodes (LEDs) in spaced-apart array. In one embodiment, a flexible substrate configured as a generally rectangular panel formed into a cylindrical shape includes a plurality of conductive traces to which the LEDs are connected both mechanically and electrically. The flexible substrate is then enclosed within a light transmissive translucent cover that is attached to a base in which is disposed a power supply. The base is shaped and configured to be threaded into a conventional incandescent light socket and includes a center terminal through which AC line power is supplied to the power supply. The power supply provides an appropriate voltage and current to energize the light sources so that they produce a white light that is emitted radially outward around a longitudinal axis of the lamp.Type: GrantFiled: August 22, 2000Date of Patent: June 17, 2003Assignee: Light Sciences CorporationInventors: James C. Chen, Darrin Huston, Brent Wiscombe
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Publication number: 20030071573Abstract: A rechargeable emergency lamp tube includes a lamp tube holder, the lamp tube holder having a base adapted to obtain AC power supply from an electric socket and a socket adapted to hold a tube for emitting light, a rechargeable battery and a control circuit board mounted inside the lamp tube holder, the control circuit board driving input AC power supply to charge the rechargeable battery and, converting DC battery power supply into AC power supply for the tube upon power failure.Type: ApplicationFiled: October 17, 2001Publication date: April 17, 2003Inventor: Yung-Lin Chien
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Patent number: 6462475Abstract: A power saving environment protection bulb comprises a cover disk having a plurality of ring portions formed therein; at a lower sides of the holes near the bottom of the cover disk being installed with tapered tracks; edges of the bottom of the cover disk being installed with tenons which are spaced with an equal distance; a circuit disk having holes for positive and negative electrodes; a middle section of the end piece having two lateral plates arranged continuously; each plate having a protrusion for sealing a taper groove on the cover disk, upper ends of the plates being formed with a sleeve which is conformable to the hole of the cover disk; a transformer plate having one side installed with two inserting tubes; a lamp seat being a plastic casing; a casing of the seat being combined with a copper cap; an inner side of the casing being formed with buckling grooves, which are arranged with equal space.Type: GrantFiled: May 31, 2001Date of Patent: October 8, 2002Inventor: Han-Ming Lee
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Patent number: 6380695Abstract: A driving device for a fluorescent tube has a high frequency oscillator which outputs a high frequency AC signal. A pulse width modulator is connected to the high frequency oscillator for outputting a PWM harmonic frequency signal. A first power switch is connected to the pulse width modulator for being turned off during a positive half-cycle of the PWM harmonic frequency signal and being turned on during a negative half-cycle of the PWM harmonic frequency signal. A second power switch is connected to the pulse width modulator for being turned on during the positive half-cycle of the PWM harmonic frequency signal and being turned off during the negative half-cycle of the PWM harmonic frequency signal. A piezoelectric transformer includes a primary winding having two input terminals connected to the first power switch and the second power switch, respectively, and a center terminal connected to the output terminal of the pulse width modulator.Type: GrantFiled: December 5, 2000Date of Patent: April 30, 2002Assignee: Institute for Information IndustryInventors: Chih-Hung Lin, Jung Chan Hsieh
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Patent number: 6366023Abstract: A starter module for a discharge lamp, especially for a motor vehicle, includes a high tension transformer which has a magnetic circuit component such as an annular core, on which a primary winding (1b) and a secondary winding are wound. The transformer further includes an arrangement for modifying its magnetic characteristics so as to reduce the saturation level of the secondary winding.Type: GrantFiled: June 20, 2000Date of Patent: April 2, 2002Assignee: Valeo VisionInventors: René Tran, Jean Marc Nicolaï
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Patent number: 6362570Abstract: An electrodeless fluorescent lamp employs a glass envelope made from a single linear tube filled with inert gas and mercury vapor. Phosphor and protective coatings are disposed on the inner surface of the envelope walls. An induction coil of few turns made from silver coated copper or Litz wire is wrapped around the linear tube in its axial direction. The inductively-coupled axially uniform plasma is generated inside the linear tube. The discharge electric field and current form a closed-loop path inside a tube in its axial direction. The lamp is operated at frequencies from 100 KHz to 100 MHz and RF power from 10 W to 2000 W (dependent on lamp size and number of turns). The lamp power efficiency and efficacy are comparable to those in electrodeless lamps of closed-loop shape operated with and without ferrite core.Type: GrantFiled: October 19, 1999Date of Patent: March 26, 2002Assignee: Matsushita Electric Works Research and Development Laboratories, Inc.Inventors: Oleg Popov, Robert Chandler
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Patent number: 6100638Abstract: A kit for converting a fluorescent lighting unit from inductive operation to electronic operation (using a high frequency ballast). The kit comprises a pair of sleeve-like adaptors which are adapted to be mounted at the ends of a straight fluorescent lighting tube, and a wiring assembly for electrically connecting the adapters. The components forming the electronic ballast can be mounted in one or both of the adapters, or can be mounted in the wiring assembly.Type: GrantFiled: March 17, 1999Date of Patent: August 8, 2000Assignee: Asian Electronics LimitedInventor: Suresh H. Shah
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Patent number: 5847514Abstract: An apparatus for generating negative ions includes two casings which are coupled each other and respectively have an outer thread on one end thereof, a lid which is fastened to the coupled casings, an electrode rod disposed within the coupled casings, an electrode plate disposed within the coupled casings, a circuit board which is disposed within the combined casings and connected to the electrode rod and the electrode plate and having at least one high voltage discharging plate, a high voltage generator which is connected to the circuit board and the high voltage discharging plate, and a plurality of ventilation slots which are respectively defined in the casings and the lid, such that the apparatus can be easily assembled, installed and utilized as an independent unit.Type: GrantFiled: November 18, 1997Date of Patent: December 8, 1998Inventor: Robert Dai
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Patent number: 5600208Abstract: A discharge lamp unit which does not require enlargement of the discharge lamp and can still prevent application of a high voltage to a cap holder when the lamp is not connected includes a core of a high-voltage transformer inside a cap of the discharge lamp. Both a primary coil and a secondary coil of the high-voltage transformer are provided around a cap holder of the discharge lamp power supply. The cap of discharge lamp is inserted into the cap holder of the discharge lamp power supply to provide an electromagnetic link between the primary coil and the secondary coil of the high-voltage transformer.Type: GrantFiled: October 18, 1995Date of Patent: February 4, 1997Assignee: Nippondenso Co., Ltd.Inventors: Kouichi Katou, Koichi Toyama, Kenji Aida
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Patent number: 5552673Abstract: A fluorescent lighting system is disclosed which provides for selective lighting of several fluorescent lamps of differing power ratings so as to provide several stages of fluorescent illumination. The ballast transformers of the fluorescent lighting system are supported in at least one ballast transformer support case which is maintained in a spaced apart relationship to at least one fluorescent lamp support case.Type: GrantFiled: October 4, 1994Date of Patent: September 3, 1996Inventor: Michael Kenwood
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Patent number: 5504394Abstract: An incandescent lamp bulb which is driven by an electronic control module (ECM) and method of manufacture characterized in that an inductor comprising a magnetic spool and a winding thereon is disposed within a screw shell base of the lamp bulb and surrounds the lamp exhaust tube therein. One end of the winding on the magnetic spool is connected to a filament wire within the screw shell base and the other end of the inductive winding is connected to an output terminal of the ECM control module. In this manner, the inductor significantly reduces the di/dt rise time of voltage and current when a TRIAC within the ECM module is driven to conduction on each one half cycle of the applied AC line voltage. This operation in turn produces a substantial reduction in radio frequency interference, both of radiation transmitted into space from the lamp bulb and by direct DC coupling back into the AC line voltage source.Type: GrantFiled: March 8, 1993Date of Patent: April 2, 1996Assignee: Beacon Light Products, Inc.Inventor: Samuel A. Johnson
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Patent number: 5488268Abstract: One half-connector terminates a set of leads in the ballast, for carrying electrical power to and from the ballast coils. Another half-connector terminates another set of leads outside the ballast, connected e.g. to carry power to lamp sockets. Male contacts, preferably formed very inexpensively as bared ends of one set of leads, are held in a first of the half-connectors; female contacts, connected to the other set of leads, are held in a second of the two half-connectors. Through-holes in the second half-connector each hold one female contact; each hole has a necked-down section, forward from the contact, and some device (preferably an ultrasonically displaced slug) to retain the contact. In one aspect of the invention, each hole also has a bore whose transverse preformed dimension is biggest immediately rearward from the necked-down forward section.Type: GrantFiled: April 8, 1994Date of Patent: January 30, 1996Assignee: Magnetek, Inc.Inventors: Fred P. Bauer, Stuart E. Sanders, Raymond H. Van Wagener, Mark R. Opperthauser
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Patent number: 5345143Abstract: A light bulb having a program disc interposed between a base and bulb components, the program disc having sockets on either side adapted to receive base and bulb pins. The program disc can be installed in various rotated positions to electrically connect one or more filaments in various ways to provide differing functions, such as successive filament energization, energizing combinations of filament or to supply varying power levels to a single filament.Type: GrantFiled: August 31, 1992Date of Patent: September 6, 1994Inventor: Charles T. Little
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Patent number: 5247228Abstract: An adaptor circuit used to enable stable, flicker-free operation of T8-type fluorescent lamps in a lighting fixture which already has a standard two-lamp, series-sequence, 40 watt, rapid-start type ballast installed therein. The adaptor circuit contains an isolation transformer for controlling the voltage supplied by the ballast to the T8-type fluorescent lamps and a frequency selective impedance modifier circuit for controlling the operating current supplied by the ballast to the T8-type fluorescent lamps at preselected frequencies. In one embodiment, the frequency selective impedance modifier circuit substantially eliminates the third harmonic component of the fundamental frequency of the operating current.Type: GrantFiled: January 2, 1992Date of Patent: September 21, 1993Assignee: GTE Products CorporationInventor: William J. Roche
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Patent number: 5241449Abstract: A radon decay product remover for use in a conventional, residential lamp. The remover screws into the light bulb socket of a lamp and provides a replacement socket for a light bulb. The flow of electric current to the light bulb is controlled by an on-off switch in the radon decay product remover. When used in a table lamp, an ion generator includes electrodes (from which negative and/or positive ions are emitted) that attach to the exterior of the lamp shade.Type: GrantFiled: January 21, 1992Date of Patent: August 31, 1993Inventors: Dade W. Moeller, Stephen N. Rudnick
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Patent number: 5239233Abstract: At the lumen output levels of most ordinary household incandescent lamps, incandescent filaments designed for and operated at about 24 Volt RMS provide substantially higher luminous efficacy than filaments designed for and operated at 120 Volt RMS. A table lamp comprises means for converting 120 Volt/60 Hz to 120 Volt/30 kHz. The 120 Volt/60 Hz is obtained from an ordinary electrical receptacle; the 120 Volt/30 kHz is provided to the lamp socket. With 120 Volt/30 kHz on the lamp socket, any ordinary 120 Volt incandescent lamp can be used therein; as can also any special incandescent lamp having a 24 Volt filament in combination with a built-in 30 kHz voltage transformer operative to convert the 120 Volt/30 kHz socket voltage into 24 Volt/30 kHz voltage for the filament.Type: GrantFiled: January 8, 1990Date of Patent: August 24, 1993Inventor: Ole K. Nilssen
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Patent number: 5122714Abstract: A transformer (10) which forms part of a lamp ignition switching device has at least its primary winding (12) composed of a foil. Moreover, the transformer has an air core. In this way a satisfactory coupling, which is also maintained at high temperatures, is obtained between the primary (12) and the secondary (11) winding. This switching device is very suitable to be built in a lamp and to ignite the lamp at a high temperature.Type: GrantFiled: April 3, 1990Date of Patent: June 16, 1992Assignee: U.S. Philips CorporationInventors: Hubertus M. J. Chermin, Egbert Van Zanten
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Patent number: 5017838Abstract: At the lumen output levels of most ordinary household incandescent lamps, incandescent filaments designed for and operated at about 24 Volt RMS provide substantially higher luminous efficacy than filaments designed for and operated at 120 Volt RMS.A frequency converter, which is adapted to be plugged into and held by an ordinary household electric receptacle, coverts the 120 Volt/60 Hz received from the power line to an output of 120 Volt/30 kHz and provides this output at a receptacle adapted to receive and hold an ordinary power plug.The power plug of an ordinary table lamp is plugged into this frequency converter, thereby providing 120 Volt/30 kHz to its lamp socket instead of the normal 120 Volt/60 Hz.Type: GrantFiled: January 25, 1990Date of Patent: May 21, 1991Inventor: Ole K. Nilssen
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Patent number: 4998044Abstract: An improved 120 Volt/40 Watt incandescent light bulb is adapted to be used in an ordinary Edison-type lamp socket and provides nearly twice the effective Lumen-output as that of an ordinary 120 Volt light bulb of same power rating and same life expectancy.The improved light bulb comprises an electronic inverter-type voltage conditioner that provides a voltage of about 15 Volt RMS magnitude to the filament of a small Tungsten-Halogen lamp. This voltage conditioner is comprised within the bottom part of the light bulb and the Tungsten-Halogen lamp is mounted right above the power conditioner--all within an outer envelope.The improved light bulb has shape and size substantially the same as that of an ordinary household 120 Volt/40 Watt light bulb.Means are provided by which the Lumen output can be manually adjusted over a wide range.In one version, the outer envelope is removable and the small Tungsten-Halogen lamp is replaceable.Type: GrantFiled: December 27, 1985Date of Patent: March 5, 1991Inventor: Ole K. Nilssen
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Patent number: 4751430Abstract: In a spark plug connector for a high-voltage distributor-less high-voltage capacitor ignition system, comprising an ignition transformer and a storage capacitor connected on the secondary side to the ignition transformer, the spark plug connector is made rod-shaped with diameter dimensions corresponding to those of a spark plug and contains the storage capacitor and ignition transformer arranged one behind the other, the ignition transformer being disposed at the end of the spark plug connector remote from the spark plug connection.Type: GrantFiled: December 16, 1986Date of Patent: June 14, 1988Assignee: BERU Ruprecht GmbH & Co. KGInventors: Helmut Muller, Werner Niessner, Dieter Teutsch
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Patent number: 4739222Abstract: A compact fluorescent lamp with a screw base having a lamp with an inner tube, an outer case which is provided at one end of the lamp and includes an operating circuit section therein and has a screw base at one end of the outer case, and a molding compound having excellent insulation and good conduction of heat which is pressed and interposed into the gap between the operating circuit section and the outer case in order to transfer the heat generated in the operating circuit section to the outer case.Type: GrantFiled: May 5, 1986Date of Patent: April 19, 1988Assignee: Hitachi, Ltd.Inventors: Ikuya Nomoto, Ichiro Torii, Kenji Kawabata
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Patent number: 4675577Abstract: An electrodeless lighting system (10) is provided for converting electromagnetic energy whose spectrum is within the ultraviolet bandwidth into energy within the visible bandwidth of the electromagnetic spectrum through excitation of fluorescent composition coatings (20). The lighting system (10) provides for an excitation mechanism (12) which generates an enclosed magnetic field, an induced electrical field, and a radiating electrical field, where the induced electrical field is substantially parallel and in the same direction as the magnetic field. Both the magnetic and induced electrical fields are applied at substantially the same frequency for accelerating and directing electrons for collision with gas composition atoms contained within a closed contour gas housing (14) and in particular within a gas housing chamber (16). An electrostatic shield (26) substantially encompasses the excitation mechanism (12) is provided for containing the radiating electrical field within the lighting system (10).Type: GrantFiled: April 15, 1985Date of Patent: June 23, 1987Assignee: Intent Patents A.G.Inventor: Jacques M. Hanlet
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Patent number: 4595864Abstract: A light-emitting diode is energized by converting a mechanical energy by means of a piezoelectric element into electrical charges which are transformed in a transformer into current pulses sufficient for activating the light-emitting diode. The component parts of a device of this invention include a rotation-symmetrical housing enclosing a striking member which is spring-biased against an opening in the housing, a piezoelectric element cooperating with the striking member and having two opposite electrodes connected to a primary winding of a pulse transformer. The secondary winding of the transformer is connected to the leads of the light-emitting diode. The piezoelectric element is pressed against the compression spring of the striking member by a connection spring leading to a terminal of the primary winding. All component parts are aligned along the center axis of the housing.Type: GrantFiled: February 2, 1984Date of Patent: June 17, 1986Assignee: Leuze Electronic GmbH & Co.Inventors: Gunther Stiefelmeyer, Konrad Langbein
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Patent number: 4514662Abstract: An arc discharge device such as a fluorescent lamp without partitions, such as a double walled hemisphere or portion thereof, a double walled conical section, a double walled cylinder, which are more intensely and fully illuminated by magnetic arc spreading techniques. The magnetic field is concentrated in the region just beyond the source of the arc to maximize the spreading effect.Type: GrantFiled: February 17, 1981Date of Patent: April 30, 1985Inventors: S. Merrill Skeist, Leo Gross
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Patent number: 4480211Abstract: A flash lamp in which a flash tube, transformer, capacitor and base are coupled together to form a unitary integral lamp. A portion of the flash tube, the transformer and capacitor may be encapsulated by a plotting compound. An electrical circuit consisting of a flash lamp and a conventional incandescent light is also provided for operation in parallel from a remotely located power supply.Type: GrantFiled: April 6, 1983Date of Patent: October 30, 1984Assignee: Federal Signal CorporationInventor: Fredrick W. Eggers
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Patent number: 4463282Abstract: A flash lamp in which a flash tube, transformer, capacitor and base are coupled together to form a unitary integral lamp. A portion of the flash tube, the transformer and capacitor may be encapsulated by a potting compound.Type: GrantFiled: May 10, 1982Date of Patent: July 31, 1984Assignee: Federal Signal CorporationInventor: Fredrick W. Eggers
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Patent number: 4409521Abstract: The electromagnetic interference produced by arc discharge lamps and other devices operating at frequencies in excess of 15,000 Hz is reduced by providing a current path external to the envelope containing the discharge, the current flow in the path being oriented so as to produce a magnetic field generally in opposition to the magnetic field generated by the current in the arc discharge. The present invention is particularly applicable to circular fluorescent lamps with a centrally disposed ballast operating at relatively high frequencies.Type: GrantFiled: June 25, 1981Date of Patent: October 11, 1983Assignee: General Electric CompanyInventor: Victor D. Roberts
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Patent number: 4341979Abstract: An arc discharge device such as a fluorescent lamp comprising an outer envelope having an inner phosphor coating. A rotating field magnetic arc spreading device is disposed in close proximity to the envelope at each end of the lamp envelope. The envelope has a circular cross section.Type: GrantFiled: February 14, 1980Date of Patent: July 27, 1982Inventors: Leo Gross, S. Merrill Skeist
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Patent number: 4337412Abstract: In a cathode-ray tube provided with a direct-heating type cathode, a transformer through which the cathode is heated is disposed within the bulb of the cathode-ray tube. This improvement eliminates the instability of heating due to the contact resistance caused between the base pins of the cathode-ray tube to which the terminals of the cathode are connected and the socket pins to which the base pins are fitted.Type: GrantFiled: November 26, 1980Date of Patent: June 29, 1982Assignee: Hitachi, Ltd.Inventors: Takao Kawamura, Kuniharu Osakabe
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Patent number: 4311943Abstract: An arc discharge device such as a fluorescent lamp comprising an outer envelope having an inner phosphor coating. An arc spreading assembly is disposed in said envelope. There is provided a recombination structure in the form of fine glass or quartz fibers disposed in the envelope.Type: GrantFiled: November 13, 1979Date of Patent: January 19, 1982Assignee: Spellman High Voltage Electronics Corp.Inventors: Leo Gross, S. Merrill Skeist
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Patent number: 4277724Abstract: An integral spark plug coil comprising a step-up coil within a canister which canister is mounted to a unique double-walled container. The container fits over the neck of the spark plug and is secured to the shell of the spark plug. An inner ceramic bushing is arranged within a metal sleeve defining the outer wall of the container. The space adjacent the neck of the spark plug is in communication with the exterior of the metal sleeve through the small quenched space defined by the inner diameter of the sleeve and the outer diameter of the ceramic bushing and through ports in the sleeve located generally outward of the terminal end of the neck of the spark plug.Type: GrantFiled: October 18, 1979Date of Patent: July 7, 1981Assignee: The Economy Engine CompanyInventor: Bruce R. Beeghly
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Patent number: 4275334Abstract: An integral spark plug coil comprising a step-up coil within a canister which canister is mounted to an aircraft-type spark plug. The canister is secured to the barrel of the spark plug. A ceramic bushing having a hub-like shape is arranged within a metal sleeve defining part of the outer wall of the canister. The space adjacent the recessed terminal of the spark plug is in communication with ports in the metal sleeve through the small quenched space defined in part by an axial face of the ceramic bushing.Type: GrantFiled: October 18, 1979Date of Patent: June 23, 1981Assignee: The Economy Engine CompanyInventor: Bruce R. Beeghly
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Patent number: 4254363Abstract: An electrodeless discharge lamp having a sealed elongated toroidal envelope containing an ionizable medium with means for inducing ionization of the medium including a radio frequency energy supply coil formed by coating a transparent conductive material on the envelope. The coil is mounted to reduce the stray radio frequency field and the torroidal envelope is formed to allow for convection cooling of the lamp.Type: GrantFiled: December 22, 1978Date of Patent: March 3, 1981Assignee: Duro-Test CorporationInventor: Peter Walsh
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Patent number: 4245179Abstract: A light source includes a planar electrodeless fluorescent lamp. The lamp envelope has two parallel light transmitting plates separated and sealed by a spacing frame, has a phosphor coating on its inner surface, and encloses a fill material which emits ultraviolet radiation upon excitation by high frequency power. The phosphor coating emits visible light upon absorption on ultraviolet radiation. An induction coil for excitation of the lamp by high frequency power includes conductive loops located on the surface of the lamp with the plane of each loop parallel to the plane of the lamp. The induction coil is configured so that current flow in adjacent loops is in opposite directions in order to minimize the far field radiation level.Type: GrantFiled: June 18, 1979Date of Patent: January 13, 1981Assignee: GTE Laboratories IncorporatedInventor: Carl F. Buhrer
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Patent number: 4240010Abstract: An electrodeless fluorescent light source includes an electrodeless fluorescent lamp and an induction coil wherein the magnitude of the far field electromagnetic radiation, produced directly by the induction coil, is minimized. The induction coil includes current loops which are configured so that the magnetic dipole moment of each current loop is offset by the magnetic dipole moment of other current loops in order to minimize the net magnetic dipole moment of the induction coil. One embodiment of the induction coil includes a conductor wound in the shape of a square prism. The current on adjacent side edges of the prism is in opposite directions, thus resulting in two pairs of mutually opposing magnetic dipole moments.Type: GrantFiled: June 18, 1979Date of Patent: December 16, 1980Assignee: GTE Laboratories IncorporatedInventor: Carl F. Buhrer
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Patent number: 4233541Abstract: Efficient starting of solenoidal electric field discharge lamps is effected with a start winding disposed on the same core with the ballast reactance. This placement of the start winding possesses certain advantages over other methods of lamp starting, and in particular it facilitates hot restart of the lamp.Type: GrantFiled: May 24, 1979Date of Patent: November 11, 1980Assignee: General Electric CompanyInventor: Armand P. Ferro
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Patent number: 4223247Abstract: The invention relates to a high-pressure sodium vapor discharge lamp which comprises a discharge tube provided with an external starting electrode. In accordance with the invention the lamp comprises a transformer wherein the secondary winding of the transformer is connected between the starting electrode and a main electrode of the discharge tube, the primary winding of that transformer being included in an oscillatory circuit including a glow starter. These further components of the starting circuit form part of the lamp. In this construction proper starting of the lamp is achieved with minimal insulation near the input terminals of the lamp.Type: GrantFiled: February 12, 1979Date of Patent: September 16, 1980Assignee: U.S. Philips CorporationInventors: Cornelis A. J. Jacobs, Jaap Rozenboom
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Patent number: 4163176Abstract: A fluorescent lamp has an extension base at one end thereof which contains an impedance to reduce current flow through the lamp. The length of the lamp plus extension base equals the length of a standard fluorescent lamp.Type: GrantFiled: October 7, 1977Date of Patent: July 31, 1979Assignee: GTE Sylvania IncorporatedInventors: Sheppard Cohen, Fredrick W. Paget, William J. Roche, Tadius T. Sadoski, Carlo S. Bessone
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Patent number: 4159510Abstract: A high intensity light source having high repetition rate and narrow pulse-width. The light source comprises a metal casing having coaxially mounted arcing electrodes therein which utilize the capacitance of the coaxial system to charge up to the arcing potential. One electrode is electrically connected to the end wall of the casing to provide a reflected wavefront from the end wall after an arc has been struck, such wavefront serving to extinguish the arc and thus provide a sharp pulse. The lamp may be used for such areas as photochemical and photobiological research, in place of much costlier nanosecond lasers.Type: GrantFiled: July 21, 1977Date of Patent: June 26, 1979Assignee: Photochemical Research Associates, Inc.Inventors: Ronald J. Kovach, Charles G. Marianik
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Patent number: 4010397Abstract: Series and shunt flashlamp triggering arrangements are disclosed wherein an electrically conductive patch is intimately bonded to a portion of the outer lateral surface of the flashlamp housing extending over a portion of the high voltage electrode and terminating at a longitudinal location along the housing substantially aligned with the inner end of the high voltage electrode. An electrically conductive wire connected to the patch extends along the outer lateral surface of the housing from the patch to at least the vicinity of the other electrode. The high voltage electrode defines a sharp-edged annular rim projecting outwardly from its lateral surface adjacent its inner end.Type: GrantFiled: October 30, 1975Date of Patent: March 1, 1977Assignee: Hughes Aircraft CompanyInventor: David T. Hon