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| Number | Title | Issue Date |
| 4134045 | System for electrical interconnection and switching of multiple lighting fixtures Prewired lighting fixtures and prewired tap boxes each having an input and output receptacle are electrically interconnected by flexible connecting cables having a plug-in connector at each end. The tap boxes have additional output receptacles for connect... | 01/09/1979 |
| 4132925 | Direct current ballasting and starting circuitry for gaseous discharge lamps Direct current ballasting and starting circuitry for efficiently operating a gaseous discharge lamp on direct current. A series-pass switching transistor in one of a pair of input lines alternately switches between on and off states to periodically supply... | 01/02/1979 |
| 4123690 | Discharge lamp ballast circuit Electrical ballast circuit of improved power factor for operating gaseous discharge lamps. Two discharge lamps are respectively connected to two inductively coupled induction coils for obtaining high power factor without the use of capacitors.... | 10/31/1978 |
| 4107581 | Fluorescent lamp insert with conductive rod support A non-light emitting insert for a fluorescent lighting fixture is used in place of a fluorescent lamp to complete a plural lamp ballast circuit so that the ballast is effective to illuminate properly any remaining fluorescent lamp coupled therein. The ins... | 08/15/1978 |
| 4097783 | Ultraviolet light processor The sources of ultraviolet light processors containing a plurality of such sources are started sequentially to reduce the current surge at start-up.... | 06/27/1978 |
| 4092562 | Fluorescent lamp unit for multiple installation A compact integral permanently assembled lamp unit comprising a fluorescent lamp, resistor ballast, starter means, and end connectors for connecting a plurality of lamps together.... | 05/30/1978 |
| 4091441 | Full-spectrum luminaire An improved full-spectrum luminaire utilizing a plurality of gas discharge lamps at least one of which produces radiant energy primarily in the near-ultraviolet range and another produces radiant energy primarily in the visible range. The spectral energy ... | 05/23/1978 |
| 4071809 | Apparatus for synthesizing of colors A synthesizer using the additive method of color synthesis and having a plurality of different color filters to provide corresponding primary color radiations which are combined to produce a tone having a specified color content. The filters are illuminat... | 01/31/1978 |
| 4070601 | Circuit arrangement for igniting at least one gas discharge flash tube A circuit arrangement for igniting at least one gas discharge flash tube having two main electrodes includes a chargeable flash capacitor connected in parallel with the flash tube and an electronic switch. These elements are connected to a voltage generat... | 01/24/1978 |
| 4053811 | Fluorescent lamp simulator A non-light emitting insert for a fluorescent lighting fixture is used in place of a fluorescent lamp to complete a plural lamp ballast circuit so that the ballast is effective to illuminate properly any remaining fluorescent lamp coupled therein. The ins... | 10/11/1977 |
| 4051413 | Transistorized static inverters A static inverter comprises switching transistors, resistors connecting the bases of the transistors with a junction point connected to a source of DC voltage. The bases of the transistor are inductively coupled by inductance means coupled with coils conn... | 09/27/1977 |
| 4008414 | Circuit for powering fluorescent lamps A circuit employing an oscillator having a feedback loop for supplying operating current at a frequency in the range 20-25 kilohertz to a pair of fluorescent lamps connected in series. The heater filament of the first lamp is made a series element in the ... | 02/15/1977 |
| 4006384 | Lead-lag, series-sequence starting and operating apparatus for three to six fluorescent lamps Lead-lag, series-sequence starting and operating apparatus for three to six fluorescent lamps comprises two parallel circuit branches, one of which comprises a ballast capacitor and two lamps in series for a three or four lamp apparatus or three lamps in ... | 02/01/1977 |
| 4001571 | Lighting system An improved system for lighting a floor area in a building. A plurality of lighting fixtures mounted in a ceiling structure for lighting the floor area are connected in one or more branch circuits. Each branch circuit is defined by a plurality of plural c... | 01/04/1977 |
| 3998539 | Illumination system An electrophotographic copying machine having a moving photoconductive member, in which an original document is illuminated by a pair of light sources, which are energized alternately to illuminate the document at a frequency of 240 hertz. This frequency ... | 12/21/1976 |
| 3969649 | Circuit arrangement for bicycle lighting systems A circuit arrangement for bicycle lighting systems including a dynamo having an output winding. Front and rear lamps connected in series across the winding. A tap divides the winding into two parts, the lamps each connecting to a corresponding winding par... | 07/13/1976 |
| 3931543 | Starting and operating circuit for gaseous discharge lamps Circuits are disclosed for starting and operating a high pressure sodium vapor lamp in combination with another gaseous discharge lamp of low voltage breakdown characteristics. The sodium vapor lamp is connected in series with a ballast induction coil, wh... | 01/06/1976 |
