Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7282863 | Auxiliary quartz lamp lighting system for electronic high intensity discharge lamp ballasts A method and electronic circuit operate a quartz auxiliary lamp lighting lamp and circuit to light a quartz auxiliary lamp at 120 Vac and 50-60 Hz current connected to an electronic HID ballast operating at a frequency of 100 Hz to over 400 kHz and voltages of from ... | 10/16/2007 |
| 7242148 | Continuous current control circuit modules of series string bulbs type (II) The invention relates to a continuous current control circuit module of series string bulbs type (II), which can maintain the normal current and voltage across each of the bulbs when any of series connected bulbs burn out. The string includes a shunt in every bulb a... | 07/10/2007 |
| 7109659 | High-intensity discharge lamp ballast and method for operating high-intensity discharge lamp A high-intensity discharge lamp ballast includes a lamp operation unit configured to supply power from a power source to a high-intensity discharge lamp, a lamp voltage detector configured to detect a voltage applied to the high-intensity discharge lamp, a lamp stat... | 09/19/2006 |
| 7102295 | Electronic device with illumination circuit and EL device utilizing the same An electronic device having an illumination circuit. The illumination circuit utilizes an AC current of an AC driving device to drive an illumination device such as an electroluminescent lamp and the remaining life of the AC driving device indicated by the brightnes... | 09/05/2006 |
| 7086758 | Series connected light string with filament shunting A string set of series-connected incandescent bulbs in which substantially all of the bulb filaments in the set are individually provided with a shunt circuit which includes a voltage responsive switch which is inoperative during normal operation of the string set w... | 08/08/2006 |
| 7045964 | Emergency lighting system with automatic diagnostic test An emergency lighting system powers all the luminaires of a lighting system during normal use, and switches from utility power to an emergency power source to drive some of the luminaires during a power outage. The typical on/off wall switch control for regular use ... | 05/16/2006 |
| 6476559 | Ceremonial luminary and associated process A ceremonial illuminary including a voltage supply mechanism, a switching mechanism that is electrically connected to the voltage supply mechanism, a first lamp electrically connected to the switching mechanism, a second lamp electrically connected to the... | 11/05/2002 |
| 6072286 | Auxiliary lighting control circuit and method for a HID lamp lighting system An auxiliary lighting control circuit and method for a lighting system having a HID lamp as the primary light source and an auxiliary light source for providing light when the HID lamp is extinguished or below full brightness but power remains available t... | 06/06/2000 |
| 5955945 | Fail safe system for providing warning signals upon the failure of motorcycle brake or tail lights A system for use in monitoring the operation of motorcycle brake and tail lights is disclosed which, upon determination that a brake or tail light is not operating properly to provide a warning light signal, automatically provides an alternate warning lig... | 09/21/1999 |
| 5430354 | HID lamp and auxiliary lamp ballast using a single multiple function switch A ballast for lighting an auxiliary source of illumination whenever a primary source of illumination fails to ignite. The auxiliary source of illumination is effectively turned OFF by placing a short circuit thereacross whenever the primary source of illu... | 07/04/1995 |
| 5256946 | Gaseous discharge lamp system with auxiliary lamp A lighting system having a primary light source and an emergency lamp. The emergency lamp is turned on and remains on upon failure or removal from the system of the primary light source. The system also includes a control device for sensing when the volta... | 10/26/1993 |
| 5175469 | Combination including an emergency lighting arrangement An arrangement for use with gaseous discharge lamp circuits having a power factor capacitor in which the capacitor can be disconnected from the circuit when the lamp is not drawing current and in which an emergency lamp can be connected across a voltage s... | 12/29/1992 |
| 5115165 | Safety lighting means for use with a high intensity discharge lamp This safety lighting arrangement is especially suited for use with variously rated HID light sources having current ratings ranging from relatively low to relatively high values. The safety light arrangement includes a current transformer having a magneti... | 05/19/1992 |
| 4862038 | Automatic relamping system An automatic relamping system that provides for operation of a single one of multiple illumination lamps with automatic illumination of a next lamp upon failure of an illuminated lamp. A drive circuit is provided for the multiple lamps including an oscill... | 08/29/1989 |
| 4727449 | Filament bypass circuit A filament bypass circuit for use with a string of lamps in series capable of continuing current flow when a lamp in the string fails. Each lamp is provided with a shunt circuit consisting of a series circuit of a diode and a silicon bilateral voltage tri... | 02/23/1988 |
| 4560906 | Lighting system and compact electric lighting unit A lighting system having a high pressure gas discharge light source and an incandescent light source within a common sealed and evacuated bulb. A ballast unit fitted externally to the neck of the bulb includes in series with the incandescent light source ... | 12/24/1985 |
| 4550272 | Operating circuit for electric discharge lamp There is disclosed an operating circuit for an electric discharge lamp in which a first DC operating circuit for starting an electric discharge lamp, a second DC operating circuit for making the electric discharge lamp operative by a voltage near a rated ... | 10/29/1985 |
| 4486689 | Emergency lighting apparatus and systems An emergency lighting unit having physical dimensions and electrical and electronic components and circuitry such that it can be directly substituted for a conventional hot cathode type fluorescent lamp in a conventional fluorescent lamp fixture which inc... | 12/04/1984 |
| 4464607 | Lighting unit An energy efficient lighting unit is described designed for functional similarity to the incandescent light used in the home. The light unit utilizes a metal vapor arc lamp as the main source of light supplemented by a standby filamentary light source. Th... | 08/07/1984 |
| 4451762 | Control circuit and system for providing emergency lighting A control circuit and system is disclosed for providing emergency lighting from a single source of electrical power which itself is capable of providing input power alternately in the form of a sinusoidal power signal and a square wave power signal during... | 05/29/1984 |
| 4438369 | Unitary light source comprising compact HID lamp and incandescent ballast filament Unitary light source comprises compact HID lamp and starting and operating circuit therefor operable from household AC energizing potential. The HID lamp is ballasted by incandescent filament means which also provides the major portion of developed light ... | 03/20/1984 |
| 4410835 | Utility emergency lamp and solid state switching and battery charging circuit therefor The power/switcher module, bi-filament light bulb, and light bulb socket, of this invention are assembled with standard lamp industry hardware and fittings to provide a lamp fixture with conventional utility increased by the addition of an integrated auto... | 10/18/1983 |
| 4399392 | Arc lamp power supply An electric arc lamp in combination with an electronically controlled incandescent filament to provide auxiliary illumination during warm-up and hot restart of the arc lamp, the filament control circuit being responsive to the arc lamp voltage and current... | 08/16/1983 |
| 4392081 | Lighting unit A lighting unit is described utilizing an energy efficient metal vapor arc lamp as the main source of light supplemented by a standby filamentary light source producing light when the arc lamp is being started. The lighting unit is designed as a more effi... | 07/05/1983 |
| 4350930 | Lighting unit A lighting unit is described utilizing an energy efficient metal vapor arc lamp as the main source of light supplemented by a standby filamentary light source producing light when the arc lamp is being started, the filament thereof serving as a resistive ... | 09/21/1982 |
| 4323821 | Luminaire converter A converter circuit for use in changing a series wired primary ballast normally employed for operating a mercury vapor lamp to a more energy-efficient high intensity discharge lamp, such as a high pressure sodium lamp, with the circuitry involved incorpor... | 04/06/1982 |
| 4278916 | Instant-on light source A light source includes a high pressure discharge lamp and incandescent filaments which provide illumination during the warm-up and hot restart periods associated with the discharge lamp. A current regulator, which provides dc power to the discharge lamp,... | 07/14/1981 |
| 4236100 | Lighting circuits Circuits are disclosed for use in a gaseous-discharge lamp lighting system which provide starting pulses to the lamp and/or a source of auxiliary light. One circuit provides starting pulses and/or auxiliary light until the gaseous-discharge lamp approache... | 11/25/1980 |
| 4232252 | Lighting network including a gas discharge lamp and standby lamp A lighting network is described which includes a main gas discharge lamp, a standby lamp and a control circuit. The control circuit senses when the gas discharge lamp is operating normally and turns off the standby lamp. When the discharge lamp is not up ... | 11/04/1980 |
| 4151445 | Instant light lamp control circuit An instant light lamp combining a miniature arc tube and a standby filament in a sealed vitreous envelope is operated by a high frequency power supply combined with a filament control circuit. The power supply comprises transforming means including voltag... | 04/24/1979 |
| 4134043 | Lighting circuits Circuits are disclosed for use in a gaseous-discharge lamp lighting system which provide starting pulses to the lamp and/or a source of auxiliary light. One circuit provides starting pulses and/or auxiliary light until the gaseous-discharge lamp approache... | 01/09/1979 |
| 4099095 | Operating circuit for gaseous discharge and incandescent lamps Gaseous discharge lamp is connected to a current sensing transformer which generates a signal when the lamp is on to turn on a triac operating a relay for turning off an auxiliary incandescent lamp which automatically operates when the gaseous discharge l... | 07/04/1978 |
| 4047076 | Emergency lighting system for gaseous discharge lamps This invention pertains to an emergency lighting circuit that operates with a high pressure, gaseous-discharge lamp and associated ballast. When the gaseous-discharge lamp goes out, after once being ignited, sufficient current is supplied to an incandesce... | 09/06/1977 |
| 4005331 | High intensity discharge lamp with auxiliary light An emergency lighting system, employing a mercury lamp and an incandescent lamp, and relay circuits for turning on the incandescent lamp in substitution for the mercury lamp, when the light output of the latter is limited, during either cold start or hot ... | 01/25/1977 |
| 3976910 | Operating circuit for discharge lamps with voltage starting circuit and auxiliary lighting means therefor Operating circuit for gaseous discharge lamps, such as those of metal vapor type, having a ballast device of conventional type is provided with high voltage generating means for applying high voltage starting pulses on the lamp. The circuit may be combine... | 08/24/1976 |
