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| Number | Title | Issue Date |
| 7071699 | Non-load driven fault monitor for electrical circuits A fault monitor for the load portion of an electrical circuit may be connected to an existing circuit by a single connection, and may detect flaws within the load portion of the circuit through the detection of changes in voltage through a resistor, caused by change... | 07/04/2006 |
| 7029145 | Low voltage decorative light string including power supply One or more strings of decorative lights are supplied with power by converting a standard residential electrical voltage to a low-voltage, and supplying the low-voltage to at least one pair of parallel conductors having multiple decorative lights connected to the co... | 04/18/2006 |
| 6271630 | High intensity discharge lighting fixture This invention is for an improved high intensity discharge lighting fixture. The lighting fixture includes a ballast which is adapted to be connected to a source of electric power. A first high intensity discharge socket is electrically connected to the b... | 08/07/2001 |
| 5105124 | Lamp failure detecting device A detecting device can centrally monitor and detect a lamp failure of one or more lamps connected in series such as guide lamps in the runway of an airfield. A core (12) is disposed on a power line (P1) of each lamp (L1 -Ln | 04/14/1992 |
| 4841196 | Two-filament lamp and operating circuit and method for designing same A two-filament incandescent lamp and operating circuit well suited to lighting applications requiring high service reliability. In the lamp, the rated operating voltage of the second filament is greater than that of the first filament. In the operating ci... | 06/20/1989 |
| 4841199 | Electrical system for vehicle daytime running lights The invention consists of an electrical circuit for a vehicle headlight system whereby the conventional parallel circuit connection of headlights is automatically converted into a series circuit connection under conditions appropriate for daytime running ... | 06/20/1989 |
| 4709188 | Operation of standby filament associated with an AC arc discharge lamp ballast An AC polarity-reversing bridge ballast for an arc discharge lamp using an incandescent filament for resistive ballasting and standby illumination powers the filament during hot restart without modifying the low duty cycle operation of the starting oscill... | 11/24/1987 |
| 4527095 | Lamp circuit apparatus A lamp and lamp circuit apparatus are provided in which the lamp has a plurality of filaments operable one filament at a time and driven by a plurality of filament drivers. A filament failure detector circuit is operatively connected to one or more filame... | 07/02/1985 |
| 4253042 | Alternating current lampchanger control circuit An alternating current lampchanger control circuit for driving a rotatable turret having a plurality of lamps, such as used in a navigational light. An input receives pulsed alternating current signals and is connected to a power circuit including fixed c... | 02/24/1981 |
| 4216525 | Truck marker light A marker or clearance light for semi trailers and the like which increases the life by a factor of from 3 to 10.... | 08/05/1980 |
| 4190777 | Position sensor for rotatable lamp changer turret A position sensor for a rotatable lamp changer turret having a plurality of lamps which are rotated in sequence to an operating position as the lamps burn out. A circular cam is positioned on the turret that includes a first position indicating portion fo... | 02/26/1980 |
| 4142129 | Lamp changing system for projectors A photocell illuminated by the projection lamp of a slide projector controls a spring-biased longitudinally movable lamp exchange carrier. Lamp failure causes a change of state in the photocell that electronically releases an electromagnetic lock and allo... | 02/27/1979 |
| 4128860 | Truck marker light A marker or clearance light for semi trailers and the like which increases the life by a factor of from 3 to 10.... | 12/05/1978 |
| 3964040 | Circuit for detecting burned-out lamp for a buoy lamp changer A lamp out detection circuit is provided for a buoy lamp changer. The circuit includes an modified Hartley transistor oscillator which is tuned to operate at a preselected frequency. A typical lamp flasher applies power to the lamp and the lamp out circui... | 06/15/1976 |
