Class 315/125 - Shunt circuit closing

Subclass of Class 315 - Electric lamp and discharge devices: systems
Definition: Systems wherein the electrical circuit in shunt is completed
No. of patents: 19
Last issue date: 11/18/2003

Number	Title	Issue Date
6650065	Decorative bulb unit with filament shunt mounted in bulb socket thereof A light string includes electrical wires to which a number of bulb sockets are connected in series. Each bulb socket defines a receptacle for receiving and retaining a bulb with the bulb in electrical connection with the electrical wires. A shunt member m...	11/18/2003
6445144	Current surge limiting circuit The present invention relates to a surge current limiting circuit of a filament lamp, meant to be connected in series between the filament and a switch that supplies an a.c. voltage, including at least one controllable active element, for limiting the cur...	09/03/2002
5638057	Ground fault detection and measurement system for airfield lighting system The present invention includes an airfield lighting and control system for energizing at least one airfield control device and containing a ground fault detection system, comprising: (1) at least one airfield control device; (2) an AC electrical circuit c...	06/10/1997
5619105	Arc detection and cut-out circuit An arc detection and cut-out circuit is connected to an electronic ballast to detect when arcing occurs and to disable the ballast when arcing occurs. The arc detection and cut-out circuit is comprised of a current detector and a shunt circuit. The curren...	04/08/1997
5545952	Self grounding lamp for special use in an underwater environment An incandescent bulb for use in a submerged swimming pool light fixture is disclosed, which includes a filament, at least one spring-biased filament support, and a grounding device. The filament support includes an exposed current-conducting portion and i...	08/13/1996
5451844	Method and apparatus for causing electric lamp to flash A circuit that includes a latch and an oscillator is attached to a common lamp control switch to cause the lamp to flash when the switch is manipulated in accordance with a prescribed pattern. The flashing draws attention to the lamp and is used, for exam...	09/19/1995
5436529	Control and protection circuit for electronic ballast A series-resonant ballast for powering at least one gas discharge lamp (16) having heatable filaments (12,15) includes: DC voltage input terminals (B+,B-); an oscillating resonant converter (55,26,51,52,53) for producing high frequency voltage for applica...	07/25/1995
5428264	Electronic ballast with controlled operating voltage In a fluorescent lamp ballast, a high-frequency AC voltage is applied directly across a tuned L-C circuit. The fluorescent lamp is connected in parallel with the capacitor of the L-C circuit and a voltage-limiting means prevents the series-resonating L-C ...	06/27/1995
5363017	Starting capacitor disconnect scheme for a fluorescent lamp A starting capacitor disconnect scheme for a fluorescent lamp system in which each starting capacitor shunts one or more series connected fluorescent lamps until all of the fluorescent lamps are ignited. Following ignition of all fluorescent lamps, each s...	11/08/1994
4725760	Structure of flasher bulb A flasher bulb and method of making same by mass production techniques are disclosed. The flasher bulb has first and second nickel wires connected by a tungsten wire to form a loop and a bimetallic strip one end of which is connected to one of the nickel ...	02/16/1988
4521822	Current transformer protection device A protection system for protecting the secondary windings of current transformers against overvoltages. The protection system consists of a device shunting the secondary winding and having a triggering device operative when the winding is subjected to a v...	06/04/1985
4329621	Starter and discharge lamp starting circuit A glow bottle starter having three lead-in wires and containing two bimetals connected together at one end and a rigid tungsten rod. The bimetals make normally closed contact with the tungsten rod in the quiescent state of the starter, and upon electrical...	05/11/1982
4328446	Method and apparatus for starting high intensity discharge lamps A high pressure sodium lamp, which includes a discharge tube enclosing xenon at pressures in excess of 300 torr, is reliably started by the combination of an igniter, a conductor wrapped around the discharge tube, and a switching circuit. The igniter prov...	05/04/1982
4177404	Arc detector for glow discharges A plurality of photodetectors in a single line exposed to a field of view transversely across the complete region of a glow discharge volume. The detectors are connected in an electronic circuit to trigger a crowbar device across the power supply circuit ...	12/04/1979
4162425	Ultraviolet detection tube quenching circuitry Circuitry directed to the rapid de-ionization of ultraviolet detectors by increasing the mobility of the ionized gases within the tubes which will enable the tubes to more effectively operate at low temperatures. The circuitry includes connecting circuitr...	07/24/1979
4156264	High power protection apparatus Protection apparatus responsive to a fault condition in a high voltage, high current device to be protected; includes an ignitron and a hydrogen thyratron, connected in parallel across the device under protection, such that in event of a fault in the prot...	05/22/1979
4112331	Device for improving the efficiency of a low-pressure sodium vapor discharge lamp A low-pressure sodium vapor discharge lamp and a current stabilizing ballast element are connected in series to an energy source so that the lamp is operated by means of a non-sinusoidal current. The temperature of the wall of the discharge tube is mainta...	09/05/1978
4105929	Shunt triggered flashtube having safety feature A flashtube has an hermetically sealed glass envelope containing an inert gas and a pair of electrodes between which an arc discharge path is defined during lamp operation, and an insulated external trigger wire at the outer surface of the envelope. The t...	08/08/1978
3968396	Self ballasted lamp including a fuseable device A filament coil is connected in series with an arc tube to form a self ballasted lamp. An internal starting coil is connected across the arc tube through a bimetal switch, which is normally closed, for energizing the starting coil. When an arc is struck a...	07/06/1976

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Class 315/125 - Shunt circuit closing