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| Number | Title | Issue Date |
| 4258293 | High intensity discharge lighting system An apparatus for connecting a high intensity discharge light to an electrical outlet has a plurality of end plates adapted to be electrically connected to an electrical outlet and to provide an electrical connection to the light. A heat sink means, and a ... | 03/24/1981 |
| 4253048 | Filament heating apparatus A filament heating apparatus for an X-ray tube having an isolation transformer through which a control signal is digitally transmitted regulates the filament current to be constantly stable. The control signal is comprised of one of a reference signal bas... | 02/24/1981 |
| 4253046 | Variable intensity control apparatus for operating a gas discharge lamp A gas discharge lamp is connected across a step down auto transformer and in series with a solid state switching device and a resistor, and this combination is connected across a rectified AC voltage source. This switching device is controlled by a monost... | 02/24/1981 |
| 4249111 | Automatic lamp shutdown circuit An automatic lamp shutdown circuit, which comprises a lamp, a line-voltage compensation control circuit for the lamp, and an automatic shutdown circuit operatively connected to the line-voltage compensation control circuit for turning the lamp off after t... | 02/03/1981 |
| 4247801 | Cathode current control system A cathode current control system comprising an electron discharge device having a tubular envelope wherein an electron gun is disposed to beam a cathode current of electrons onto a spaced anode collector electrode, the gun including an electron emitting c... | 01/27/1981 |
| 4246517 | SCR lamp supply A silicon controlled rectifier (SCR) lamp supply circuit for controlling the amount of rectified voltage delivered to illumination lamps in a document image capturing system includes electronic components for linearizing the transfer function of the circu... | 01/20/1981 |
| 4240009 | Electronic ballast An electronic ballast for starting and operating gaseous discharge lamps from a low voltage d-c source which employs a regulated inverter providing controlled high ignition voltage, constant current warm-up and constant wattage operation for one or more l... | 12/16/1980 |
| 4238710 | Symmetry regulated high frequency ballast A gas discharge lamp is connected across an inductor and in series with a solid state switching device and a resistor, and this combination is connected across a voltage source. This switching device is controlled by a monostable multivibrator, the input ... | 12/09/1980 |
| 4237405 | Method and apparatus for conserving energy A method and apparatus for regulating the luminous flux generated by a lamp with the degeneration of the voltage from a power source such as a battery. The regulating circuit maintains a constant luminous flux output from a lamp over a substantial range o... | 12/02/1980 |
| 4236101 | Light control system In an area illuminated by both artificial and natural light sources, a control system is implemented to reduce the energy consumption by proportionately dimming the artificial sources to a level such that the sum of natural plus artificial light is held e... | 11/25/1980 |
| 4236058 | Regulation of electron-beam welding generators A method of and apparatus for regulating an electron-beam welding generator of the kind having three electrodes viz: a cathode, a Wehnelt electrode and an anode. The method is characterized by a suitable combination of two methods of regulating an electro... | 11/25/1980 |
| 4233558 | Regulated dual DC power supply A dual section power supply, one section for supplying high voltage dc po and the other section for supplying low voltage dc power, are each connected to a common ac source. The high voltage section employs a phase-controlled rectifier, the control circu... | 11/11/1980 |
| 4230971 | Variable intensity control apparatus for operating a gas discharge lamp A gas discharge lamp is connected in parallel with an inductor and in series with a solid state switching device and a resistor, and this combination is connected across a rectified AC voltage source. This switching device is controlled by a monostable mu... | 10/28/1980 |
| 4230970 | Method and apparatus for saving energy A method and apparatus for regulating the output flux generated by a lamp with the degeneration of the voltage from a power source such as a battery. The regulating circuit maintains a constant luminous flux output from a lamp over a substantial range of ... | 10/28/1980 |
| 4225808 | Selective illumination Different portions of an area are selectively highlighted in response to observer proximity. An adjustable dimmer establishes the non-highlight illumination level for each area. The dimmer is overridden by observer-sensing circuitry to produce the highlig... | 09/30/1980 |
| 4221994 | Photo curing light source A compact, lightweight source of radiation at wavelengths ranging from long wave ultraviolet through the visible powered from a low power DC source wherein a high frequency oscillator provides regulated driving current for the excitation of a fluorescent ... | 09/09/1980 |
| 4220896 | High frequency lighting inverter with constant power ballast A lighting inverter for operating an electrical discharge lamp from a direct current power source. The inverter includes a resonant feedback inverter which converts the output of the d.c. power source to an alternating current output and regulates the a.c... | 09/02/1980 |
| 4219761 | Incandescent lamp dimmer providing control voltage IES square law compliance correction A dimmer and regulation circuit connected to an incandescent lamp load for controlling the voltage thereto from an ac source by gating off a portion of each cycle. The circuit used to provide the gating includes a pulse generator controlled by a timer pro... | 08/26/1980 |
| 4219759 | Three phase power control unit A three phase voltage controller for controlling the voltage applied to a three phase load. The controller includes three autotransformers which have a plurality of output taps for stepping down the output voltage. Contacts to the taps are selected for a ... | 08/26/1980 |
| 4218627 | Electrical mean square voltage sensor A sensor for producing an electrical signal parameter responsive to the mean square of an applied alternating voltage has a rectifier element, and has a zener diode element electrically in series with a light-emitting diode element across the direct volta... | 08/19/1980 |
| 4211955 | Solid state lamp An integrated circuit chip containing one or more light-emitting diodes is mounted within a light-diffusing encasement having a standard incandescent light bulb lamp base. The integrated circuit chip also contains a rectifier and voltage regulator circuit... | 07/08/1980 |
| 4208965 | Method for electrostatic assistance in printing processes, and printing machines having electrostatic substrate contact pressure A method for electrostatic assistance of the printing process in printing machines, in which method a printing substrate, being of a material which is not electrically conductive, is passed between a printing cylinder coated with printing ink and a contac... | 06/24/1980 |
| 4204141 | Adjustable DC pulse circuit for variation over a predetermined range using two timer networks A circuit for providing a dc pulse, such as to a gated semiconductor for at least partial bypass of a ballast element connected to an HID lamp, the pulse being developed within a time range of an associated ac voltage. A first timer operably connected to ... | 05/20/1980 |
| 4189664 | Power control unit for automatic control of power consumption in a lighting load The present invention is a power control unit and method of controlling power particularly for lighting loads such as incandescent lamps and fluorescent lamps. The power control unit is located between the power source and the load, typically between a ci... | 02/19/1980 |
| 4186329 | Electrical power supplies An electrical power supply for an X-ray tube has a source capable of providing constant current at a desired potential to a capacitor means which supplies pulses of current in excess of the source current to the X-ray tube. As each pulse is supplied, the ... | 01/29/1980 |
| 4182977 | Constant output light emitting device A light emitting device which provides substantially constant output power is disclosed. The light emitting device includes a light emitter and a compensating circuit for supplying current to the light emitter so that at any given time an increase in elec... | 01/08/1980 |
| 4177406 | Circuit for adjusting tube anode current in an X-ray generator Filament current values associated with different X-ray tube anode currents and voltages are stored in various locations of a memory. For an X-ray exposure, the measured value of filament current or anode current is compared with the values stored and the... | 12/04/1979 |
| 4170747 | Fixed frequency, variable duty cycle, square wave dimmer for high intensity gaseous discharge lamp A dimmer circuit for an HID lamp is provided for supplying a square wave current therethrough at a constant frequency, but whose duty cycle is variable dependent on a sensed current level. The circuit employs a first pair of transistor switches for revers... | 10/09/1979 |
| 4170745 | Lamp flashing circuit for line generating photoexposure device A circuit is disclosed for flashing a flash lamp in a photoexposure device which exposes lines on a photosensitive surface by projecting onto the surface a repetitive series of light spots the locus of which is moved relative to the surface so that the in... | 10/09/1979 |
| 4162428 | Variable inductance ballast apparatus for HID lamp Variable inductance ballast apparatus for high-intensity discharge (HID) lamp comprises a laminated E-I core having non-magnetic gaps intermediate the E-conformed and I-conformed members. A main winding is carried on a leg of the E-conformed member to pro... | 07/24/1979 |
| 4160934 | Current control circuit for light emitting diode The current in a semiconductive light emitting diode (LED), driven by an insulated gate field effect transistor (IGFET) switch, is stabilized by a current control circuit including a comparator type feedback network, which stabilizes the voltage at a node... | 07/10/1979 |
| 4160192 | Delayed turn-off switching circuit An electronic circuit for de-energizing a lamp or other load after a predetermined period of time uses a gate controlled switch, e.g., thyristor, connected between the load and a source of A.C. voltage. The gate of the thyristor receives control current t... | 07/03/1979 |
| 4156166 | Method and apparatus for saving energy A method and apparatus for regulating the output flux generated by a lamp with the degeneration of the voltage from a power source such as a battery. The regulating circuit maintains a constant luminous flux output from a lamp over a substantial range of ... | 05/22/1979 |
| 4155032 | Constant illumination apparatus An apparatus that provides constant illumination in response to an AC input power source having variable magnitude. The input power passes through a full wave rectifier and is then switched by a solid state switching device having conductive and nonconduc... | 05/15/1979 |
| 4149110 | Brightness controlled CRT A cathode ray tube control system comprising a cathode ray type tube having a tubular envelope wherein an electron gun is disposed to direct an electron beam onto a spaced anode target screen, the gun including an electron emitting source aligned with an ... | 04/10/1979 |
| 4146819 | Method for varying voltage in a high intensity discharge mercury lamp A method for varying the voltage in a high intensity discharge mercury lamp comprising the following steps: (a) energizing the lamp at a substantially fixed current; (b) selecting a predetermined voltage; (c) sensing the lamp voltage; and (d) when the lamp voltage ... | 03/27/1979 |
| 4135116 | Constant illumination control system A constant illumination level control system for continuously adjusting the evel of artificial illumination in an area of controlled lighting to complement available natural illumination. A photocell sensor in combination with an input amplifier generates ... | 01/16/1979 |
| 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 |
| 4126814 | Electron gun control system An electron gun is controlled by a system which stores the characteristics of the gun in a random access memory. The contents of the memory feed an electron gun driver which properly biases the gun. The characteristics of the gun are stored in the memory ... | 11/21/1978 |
| 4121136 | Apparatus for feeding discharge lamps from a direct current source Apparatus for feeding a discharge lamp such as a mercury vapor lamp mounted in series with a choke from a direct current source comprising a chopper of direct current including an electronic switch and a detector of current intensity mounted in series wit... | 10/17/1978 |
