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| Number | Title | Issue Date |
| 7368916 | Apparatus and methods for making capacitive measurements of cathode fall in fluorescent lamps Apparatus and methods for measuring cathode fall in fluorescent lamps are disclosed. Together with measurements of cathode temperature, such measurements of cathode fall may inform a determination of cathode heater voltage as a function of discharge current (i.e., a... | 05/06/2008 |
| 7293896 | Led decorative light string The present invention provides a LED decorative light string that comprises one or more branch circuits, each of said more branch circuits is connected in parallel with each other, and then connected to a common power supply wire for importing operational voltage; e... | 11/13/2007 |
| 7282869 | HID ballast and lamp tester The instant invention relates to an HID ballast and lamp tester, which provides visual indication of failure of either the ballast or lamp by continuously monitoring the status of the HID lighting system. The HID ballast and lamp tester detects and utilizes the volt... | 10/16/2007 |
| 7264381 | Light emitting diode assembly using alternating current as the power source An LED assembly includes a first LED unit and a second LED unit, the latter is coupled electrically to the first LED unit in such a manner that each of the first and second LED units defines a current-flow direction in reverse order so that once Alternating Current ... | 09/04/2007 |
| 7238326 | Germicidal treatment system with status indicator There is disclosed a germicidal treatment system having a status indicator. The germicidal treatment system comprises at least one mounting assembly attachable to an outside of a wall of an air handling apparatus. Each of the mounting assemblies includes a germicida... | 07/03/2007 |
| 7127499 | Medical diagnostic system service method and apparatus A system is provided for remotely servicing medical diagnostic systems. The diagnostic systems may include a range of modalities and system types. A remote service facility may be contacted by the diagnostic systems, or may contact the diagnostic systems via a netwo... | 10/24/2006 |
| 7038398 | Kinetic illumination system and methods The present invention relates to methods of creating eye-catching displays by taking advantage of color-changing illumination provided by LED systems disclosed herein. Displays can be made to appear to change color or to move simply by changing the color of the ligh... | 05/02/2006 |
| 7023353 | Warning device status circuit including a status output device A warning device including a status and function indicator circuit for indicating the status and function of the warning device. In a visual warning device such as a strobe light, the status and function indicator circuit includes a status output device such as an L... | 04/04/2006 |
| 6992591 | Marker lights for wireless doorbell transmitters and other devices Battery powered LEDs operated at a small fraction of their rated capacity to provide a level of illumination useful as a marker for darkness adjusted vision. Long battery life is achieved using super bright, broad spectrum LEDs. ... | 01/31/2006 |
| 6963170 | Lamp monitor and lamp The present invention discloses a lamp comprising a lamp housing mounting an electrically driven light and a monitor circuit, the housing having power supply terminals for connection of the light to a power supply and the monitor being connected to the light such as... | 11/08/2005 |
| 6388393 | Ballasts for operating light emitting diodes in AC circuits Several types of ballast circuits for operating one or many LEDs in AC circuits finding particular use in aircraft lighting panels are disclosed. The first type is a linear transfer function ballast using inductors to limit diode current, and capacitors t... | 05/14/2002 |
| 6069452 | Circuit configuration for signal transmitters with light-emitting diodes A circuit configuration for emitting light signals in a road traffic systems. A plurality of LEDs for emitting colored light are supplied with an a.c. voltage. The LEDs are arranged in two groups of LEDs which are connected antiparallel to one another. Tw... | 05/30/2000 |
| 5748094 | Switch with current flow detector A switch for use in an AC circuit wired in a three-way switch mode for supplying power to a load, has a first terminal for connection to an external line, second and third terminals for connection respectively to corresponding terminals of a second like s... | 05/05/1998 |
| 5657117 | Device for examining optical waveguides A device for examining optical waveguides comprises a prism to be positioned on the waveguide to be investigated, an entering point at which incoming light enters the device, and control devices for altering the angle of light directed to the prism from t... | 08/12/1997 |
| 5614790 | Automatic alarm for fluorescent blinking Alarming mechanism, sounding and/or flashing, which signals fluorescent lamp malfunctioning as visibly manifested by flickering. The alarming mechanism according to this invention electrically engages the starter mechanism of a fluorescent lamp and is res... | 03/25/1997 |
| 5422543 | Flash monitor alarm system A flash monitor alarm system is provided for detection of emergency vehicle flashers or for detection of flashes in photography. For emergency flasher detection the unit is positioned in a vehicle within a direct line of sight of potential emergency flash... | 06/06/1995 |
| 5416384 | Back-up lighting system This is an emergency lighting system that provides an emergency driving voltage to drive at least one lamp when the AC power input to the lamp is detected as absent. A rechargeable battery pack and recharging circuit are contained in a first modular housi... | 05/16/1995 |
| 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 |
| 5017837 | Indicator lamp system An indicator lamp indicates the status of an electrically-powered load control system by providing dim light when the load power is off and a brighter light when the load power is on. In another embodiment, the lamp not only provides two levels of light t... | 05/21/1991 |
| 4998042 | Self-relamping clearance/marker light assembly A self-relamping clearance/marker light assembly includes a pair of lamps connected to a proving ring switch. A primary one of the almps is lighted and the switch prevents current flow through a secondary one of the lamps until the primary lamp burns out.... | 03/05/1991 |
| 4792701 | Failure compensation circuit with thermal compensation A failure compensation circuit automatically reduces the output voltage of a power supply when a portion of a load drops out. The compensation circuit includes a circuit for generating a control signal representative of the desired voltage across the load... | 12/20/1988 |
| 4572987 | Lamp monitoring circuit In order to provide a lamp failure warning in both illuminated and unilluminated states of the lamp, there is provided a resistance bridge circuit Rs, L, R2 and R3 which is substantially in balance if the lamp L is sound. An amplifier IC1 acts as a detect... | 02/25/1986 |
| 4515452 | Data inserting device for camera A data inserting device for a camera arranged to automatically insert data in response to an insertion trigger signal from the camera body includes abnormity detecting means which supplies current to a specific part where such abnormity that hinders the d... | 05/07/1985 |
| 4496939 | Power indicator apparatus for a DC to DC flyback converter A battery power indicator for a DC to DC flyback converter is responsive to the current flowing in the secondary winding of the converter's transformer. In one embodiment the power indicator is lighted when the battery is weak but not dead. If the battery... | 01/29/1985 |
| 4467246 | Light quantity controller and input device A light quantity controller and an input device are disclosed. The light quantity controller comprises a light source, a photo-sensor to detect a light quantity of the light source, a signal source for generating a reference signal, a comparator for compa... | 08/21/1984 |
| 4451822 | Device for automatically checking a plurality of electric indicator lights The invention relates to a device for checking a plurality of indicator lights, wherein the intensity passing through each indicator light is sequentially measured and the measurements are compared with nominal intensities. The invention is more particula... | 05/29/1984 |
| 4396870 | Electronic flash device An electronic flash device provided with an auxiliary winding electromagnetically coupled to a winding in a DC-DC converter which is connected to a main power supply and generates a voltage for charging a main flash capacitor, an auxiliary capacitor adapt... | 08/02/1983 |
| 4380718 | Trailer marker light substitution circuit An improved dual polarity substitution circuit for energizing a secondary load, such as an incandescent lamp, upon failure of a primary load. Dual polarity is achieved through the use of parallel PNP and NPN transistors, one of which conducts so long as t... | 04/19/1983 |
| 4359670 | Lamp intensity control apparatus comprising preset means Push buttons (9u, 9d) are provided to select the desired intensity of a lamp (1) for electrostatic copying or the like. The selected intensity is numerically displayed. A preset function is provided to preset the intensity to a standard value when power i... | 11/16/1982 |
| 4358714 | Light dimming system for grounded-side control of discrete indicator lamps A light dimming system for simultaneously controlling the brightness of a plurality of two-terminal indicating lights, each having one terminal connected to receive a constant voltage relative to ground. The system includes a single dimmer control for pro... | 11/09/1982 |
| 4318031 | Lamp, ballast and starter visual monitor A visual monitor including a single light indicator for HID lamps (not needing a starter) and a visual monitor including two light indicators for an HID lamp, such as a high pressure sodium lamp, operating in conjunction with the starter. When the lamp is... | 03/02/1982 |
| 4315196 | Disconnection detecting circuit of double-filament spherical lamp A fault detection apparatus for use with a double-filament lamp utilizes the temperature-related changes in resistance of the non-energized filament to indicate a break in the energized filament. The circuit of the apparatus includes, for each filament, a... | 02/09/1982 |
| 4311576 | Electric corrosion preventing apparatus An electric corrosion preventing apparatus with a circuit having an indication lamp for indicating an operation state of the apparatus, which is used for preventing an inside wall of a hot-water receptacle, such as a water heater and a boiler, from being ... | 01/19/1982 |
| 4296356 | Ionization vacuum gauge circuit In a circuit for an ionization vacuum gauge having a thermionic filament, a control circuit receptive of a control current for controlling the filament and a switch for applying the control current to the control circuit, a circuit is provided for indicat... | 10/20/1981 |
| 4295079 | Lamp circuit with disconnected lamp detecting device A lamp circuit is provided having a constant current type AC power source and a plurality of isolation transformers connected in series with the AC power source. The secondary circuit of each isolation transformer is connected to an electric lamp. The vol... | 10/13/1981 |
| 4274084 | Audio-visual signal circuits An audio-visual alarm includes a flashtube and a voltage signal generator for producing and storing voltages sufficient to operate the flashtube. In series with the flashtube and the voltage generator is the coil of an audio alarm, whereby operation of th... | 06/16/1981 |
| 4271375 | Flash light discharge device In a flash light discharge device including a strobo tube attached to a camera body, both the positive and negative outputs of a blocking oscillator are made use of. One output is used for charging a main capacitor for making the strobo tube discharged, a... | 06/02/1981 |
| 4259615 | Photographic flash device A photographic flash device comprising a main capacitor for flashing a flash discharge tube, a DC-DC converter, a constant-voltage circuit for controlling the oscillation function of the DC-DC converter and an indication means capable of discriminatively ... | 03/31/1981 |
| 4258290 | Operation indicator for auto-strobo unit An operation indicator for auto-strobo unit which includes a single light emitting element capable of indicating the completion of a charging operation or a flashlight illumination of the auto-strobo unit, comprises a bypass circuit which any current flow... | 03/24/1981 |
| 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 |
