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| Number | Title | Issue Date |
| 7436121 | Light source device A light source device for a projector device having a discharge lamp with a silica glass discharge vessel containing a pair of opposed electrodes and at least 0.15 mg/mm3 of mercury, a concave reflector which surrounds the discharge lamp and reflects ligh... | 10/14/2008 |
| 7102110 | Magnetron oscillating apparatus A magnetron oscillating apparatus includes a magnetron, power supply unit, and switch circuit. The magnetron oscillates a microwave. The power supply unit applies a power to the magnetron. The switch circuit is connected between the power supply unit and the cathode... | 09/05/2006 |
| 6933684 | Electronic ballast using cut and save technology An ideal filament preheat technique in flourescence lamp is supplied by an adjusting circuit, an output circuit and a control circuit. At the filament preheating stage, an adequate preheating voltage is provided for the filament of the lamp tube, and the voltage cro... | 08/23/2005 |
| 6906468 | Ballast device for uv radiator and also method and device for disinfecting water The invention relates to a novel ballast device for pre-heating, starting and operating at least one UV emitter, constructed in the form of a gas discharge lamp with two heating coils lying opposite each other in relation to a gas discharge path, whereby four electr... | 06/14/2005 |
| 6157135 | Halogen lamp with high temperature sensing device A lighting device including a temperature sensing device for controlling the operation of the light emitting device. The lighting device includes a housing, a reflector coupled to the housing, a bulb received in the housing, the bulb being connected to a ... | 12/05/2000 |
| 5483125 | Ballast circuit for a gas discharge lamp having a cathode pre-heat arrangement A ballast circuit for a gas discharge lamp, of the type having a pair of resistively heated cathodes that are resistively heated both during a cathode pre-heat period prior to lamp turn-on, and during steady state lamp operation, is disclosed. The ballast... | 01/09/1996 |
| 4914354 | Reactor-type ballast circuit An improved, more energy efficient reactor-type ballasting circuit for fluorescent lamps includes an inductive ballasting coil for directly applying an AC line voltage to the cathodes of a lamp without an intermediate autotransformer and also includes a g... | 04/03/1990 |
| 4866347 | Compact fluorescent lamp circuit A starting and operating circuit for a super compact fluorescent lamp includes ballast and discharge circuits for applying current to the filaments of the lamp and then apply starting pulses which enable the lamp to commence operation. The circuits includ... | 09/12/1989 |
| 4749909 | Compact igniter for discharge lamps A ballast-inverter circuit for a discharge lamp with preheatable electrodes. The lamp is connected to the supply voltage input terminals via a ballast impedance. A triac provides a preheat current path for the lamp electrodes and has a gate electrode conn... | 06/07/1988 |
| 4742275 | High pressure metal vapor discharge lamp with starting element A high pressure metal vapor discharge lamp comprises a light-emitting tube in which a pair of electrodes is enclosed, a starting element including a normally closed-type thermal switch and a resistive member, the starting element generating a pulse by clo... | 05/03/1988 |
| 4737689 | Thermal delay light arrangement The arrangement of this invention includes circuitry for sequentially lighting a series of lamps, followed by extinguishing them in unison; said circuitry including, in association with each lamp, at least one bi-metallic element for controlling the openi... | 04/12/1988 |
| 4730147 | Method and arrangement for the operation of a gas discharge lamp For the operation of warm start gas discharge lamps upon employment of an electronic ballast wherein the gas discharge lamp lies parallel to the effective capacitance of a series-resonant circuit and has its heater coils incorporated into this series-reso... | 03/08/1988 |
| 4647893 | Rapid-start fluorescent lamp having a bimetal circuit breaker with leg portions of unequal length A rapid-start fluorescent lamp includes a circuit breaker having a sealed glass bottle, a pair of electrical conductors sealed therein and passing therethrough and a thermally sensitive bimetal switch within the glass bottle with the bimetal switch having... | 03/03/1987 |
| 4647817 | Discharge lamp starting circuit particularly for compact fluorescent lamps To provide for reliable ignition of low-pressure discharge lamps, particularly compact fluorescent lamps, operated at high frequency, for example in the order of about 45 kHz, an ignition circuit is connected in parallel to the lamp and serially with the ... | 03/03/1987 |
| 4600861 | Fluorescent lamp circuit breaker A rapid-start fluorescent lamp includes a pair of spaced electrodes within an envelope with one electrical lead connected to an electrode and the other lead coupled to the electrode by a thermally-sensitive bi-metal strip whereby one end of the bi-metal a... | 07/15/1986 |
| 4600860 | Rapid-start fluorescent lamp closure switch A rapid-start fluorescent lamp has a thermally-sensitive circuit breaker disposed thereon for disconnecting the electrodes of the lamp from an energizing source at a given range of bulb temperatures and for connecting the electrode to the energizing sourc... | 07/15/1986 |
| 4593231 | Three-way fluorescent lamp device A ballast circuit for starting and operating a preheat type circular fluorescent lamp, which replaces a multiple wattage incandescent lamp in a three-way incandescent lamp socket, so that the fluorescent lamp can be ignited to function at three different ... | 06/03/1986 |
| 4528479 | Circuit breaker by-pass element A circuit breaker for a rapid-start fluorescent lamp includes a pair of electrical conductors sealed into a glass bottle, a bimetal switch within the bottle having one end affixed and the other end contacting the pair of electrical conductors and a meltab... | 07/09/1985 |
| 4465954 | Discharge lamp starting and operating circuit Apparatus for starting and operating a discharge lamp includes a starting device having bimetals and a rigid conductive member forming a switch, a ballast coupling the switch to an AC source and a discharge lamp and a spark gap each shunting the starting ... | 08/14/1984 |
| 4461976 | Discharge lamp starter A discharge lamp starting device employing a thermal switch which comprises main and auxiliary bimetal electrodes respectively thermally bendable in the same direction, and an auxiliary heater for heating the auxiliary bimetal electrode in addition to a m... | 07/24/1984 |
| 4425530 | Time delay lamp ballast circuit A multiple fluorescent lamp ballast circuit of the rapid start type in which heating current is supplied to the lamp cathodes. A time delay switch is connected in series with a starting capacitor across one or more of the lamps, to delay lamp starting unt... | 01/10/1984 |
| 4398123 | High pressure discharge lamp A high pressure discharge lamp in which the restriking voltage and time are significantly decreased. A pair of electrodes are sealably disposed in a tube containing an appropriate amount of mercury. Means is provided for heating at least one of the electr... | 08/09/1983 |
| 4358711 | Circuit arrangement for starting and operating a gas- and/or vapor discharge lamp A circuit arrangement for starting and operating a discharge lamp by means of an electronic ballast includes a series arrangement of a PTC resistor and an ohmic resistor connected in parallel with an electronic switch of the ballast, with only the PTC res... | 11/09/1982 |
| 4345186 | Metal vapor discharge lamp A metal vapor discharge lamp comprises main electrodes and an auxiliary electrode in an arc tube to initiate the discharge between the main electrode and the auxiliary electrode at the initiation of the operation and then to result the discharge between t... | 08/17/1982 |
| 4344018 | High pressure metal vapor discharge lamp A high pressure metal vapor discharge lamp according to the present invention comprises the following first and second starting aid circuits mounted within an outer envelope. The first starting aid circuit includes a starting aid and a first thermal switc... | 08/10/1982 |
| 4337418 | Starter unit for gas discharge lamps powered by alternating-current mains A starting circuit for gas discharge lamps, such as fluorescent lamps, includes a relay coil controllable switch. A rectifier-multiplier has its input connectable to the alternating-current mains via the controllable switch. A polarity-reversing switch is... | 06/29/1982 |
| 4325004 | Method and apparatus for starting high intensity discharge lamps Method and apparatus for starting high intensity discharge lamps utilizing a spiral line pulse generator to generate high voltage, short duration starting pulses. The spiral line pulse generator includes two conductors and two insulators, each in the form... | 04/13/1982 |
| 4321447 | Energization circuit for a microwave oven An energization circuit for a microwave oven employs a PTC thermistor to eliminate high transient current surges resulting from energization and deenergization of induction elements therein to provide circuit protection both during oven start and operatio... | 03/23/1982 |
| 4282461 | Television raster centering aid A television raster centering aid comprises means for blanking a horizontal scan line located at the center of the vertical deflection field. In an illustrative embodiment, an operational amplifier is used to indicate the presence of the deflection field ... | 08/04/1981 |
| 4277725 | Gas and/or vapor discharge lamp The invention relates to a high-pressure sodium lamp which is provided with a discharge tube having an external auxiliary electrode. The auxiliary electrode is switched off by a bimetallic switch in the operating condition of the lamp. According to the in... | 07/07/1981 |
| 4256991 | Electronic igniter for fluorescent lamps Methods and apparatus for electronically igniting gas discharge lamps, such as hot- or cold-cathode fluorescent lamps, various high-pressure, metal-gas, and halogen-gas lamps. The initial heater current, in the case of hot-cathode lamps, or the initial hi... | 03/17/1981 |
| 4214186 | Circuit for transistor ballasts for the gentle ignition of fluorescent lamps A ballast circuit for controlling the ignition characteristics of a preheat type fluorescent lamp of the type having a transformer with a primary, operating secondary, filament and auxiliary ignition windings, in which there is provided a rectifier having... | 07/22/1980 |
| 4001634 | Discharge lamp having thermal switch starter A high pressure sodium vapor lamp utilizing an alumina ceramic arc tube within an outer glass envelope is provided with a bi-metal switch which short circuits the arc tube at starting. Current flow through the switch causes it to heat up and open the shor... | 01/04/1977 |
