Quotables
"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "
Mark Twain ; Christmas greetings, 1890
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| Number | Title | Issue Date |
| 7363522 | Apparatus and methods for information handling system with power supply device with variable output power An information handling system includes a power source configured to provide a plurality of power levels to a load. At least one of the plurality of power levels corresponds to a level obtained by de-rating a capacity of the power source from a nominal design specif... | 04/22/2008 |
| 7227341 | Circuit for use with switched leg power supply A circuit for use with a power supply coupled in a switched leg of, for example, a lighting circuit, is described. The circuit provides a low impedance near the zero crossing of the AC signal and a high impedance thereafter, thereby allowing the power supply to draw... | 06/05/2007 |
| 7218498 | Touch switch with integral control circuit A touch switch apparatus for detecting the presence of an object such as a human appendage, the apparatus having a touch pad, an electric field generated about the touch pad and also having a preferably integrated and local control circuit connected to the touch pad... | 05/15/2007 |
| 5883503 | Voltage compensation system A voltage compensation system for an A.C. power line supplying one or more air conditioners, a telephone system or other telecommunication system, a battery charger, or some other utilization system that should have an input voltage within a given normal ... | 03/16/1999 |
| 5712554 | Voltage compensation device A voltage compensation device for a two-conductor A.C. power line supplying one or more air conditioners, a telephone system or other telecommunication system, or some other utilization system that requires an input voltage within a given range. The devic... | 01/27/1998 |
| 5521593 | Method and apparatus for monitoring operating characteristics of semiconductor electric power switching circuits A monitoring system for an electrical power control system having a plurality of electrical components operable in electrically conductive and non-conductive states in response to command signals from a system controller. The controller is connected for r... | 05/28/1996 |
| 5519311 | Control of AC power to inductive loads A control system is provided for controlling the average power from an alternating voltage source (AC) to a load having inductive properties. The system uses a synchronous switch shunted by a capacitor connected between the source (generator) and sink (lo... | 05/21/1996 |
| 4816698 | Touch control circuit for incandescent lamps and the like A touch control circuit is disclosed, which delivers power at any one of a plurality of different levels. To accomplish this, a line cycle delay timer provides a plurality of output signals, each signal being spaced apart in time from the line voltage zer... | 03/28/1989 |
| 4730228 | Overtemperature detection of power semiconductor components The temperature of the power semiconductor component is sensed by a bipolar transistor. The bipolar transistor is in series with a depletion mode MOSFET whose gate and source electrodes are connected together. The drain electrode is also connected to a th... | 03/08/1988 |
| 4713721 | Lighting fixture overload protector A two-terminal A.C. device is described which can be series connected with a lighting fixture to prevent overheating of the fixture in an overload condition, namely, when a lighting element exceeding the power rating of the fixture is installed. In broad ... | 12/15/1987 |
| 4713598 | Power supply associated with AC line relay switch A relay switch in an ac main line has a dc-powered applying for applying amplified control sensor signals to the control circuit of the relay switch. To provide dc power for the amplifier when the relay switch main controlled current conduction path is co... | 12/15/1987 |
| 4675777 | Temperature-responsive circuit for load control apparatus A temperature-responsive circuit, for operation with a load-control apparatus having a control input for adjusting the magnitude of power applied to a load from a source, uses: a sensor responsive to the temperature in the vicinity of the load-control app... | 06/23/1987 |
| 4651022 | Digital touch operated switch A touch operated switch for control of electrical lighting, appliances, machinery and equipment which requires non sparking fail-safe operation. The switch utilizes digital complementary metal oxide semi-conductor technology which requires nearly insignif... | 03/17/1987 |
| 4644138 | Temperature control system with simplified controller and power supply The invention includes a simple and inexpensive thermal controller and simple and inexpensive radio frequency alternating current generator which are provided in an improved temperature control system for a resistively heated electrochemical cell. The tem... | 02/17/1987 |
| 4584519 | Incremental touch-operated switch This patent presents a touch-responsive switch which incrementally varies AC voltage supplied to an electrical apparatus. The invention includes digital circuitry which compares a control pulse train with a touch affected pulse train to create a switching... | 04/22/1986 |
| 4580088 | Soft-starting phase-control circuit for low voltage load A soft-starting phase-control circuit for controlling both the cold in-rush and normal operating flows of current through a load from an A.C. source. The load may be resistive, may have a non-zero resistance temperature coefficient and may require a load ... | 04/01/1986 |
| 4571537 | Condition monitoring means A monitoring circuit for monitoring the condition of, for example, a remotely situated structure is shown as having a transducer responsive to the occurrence of a preselected condition in the remotely situated structure and effective for causing a signal ... | 02/18/1986 |
| 4513207 | Alternating comparator circuitry for improved discrete sampling resistance control A pair of comparators, each having the same reference potential at a first input, each have a second input alternatingly receiving different ones of first and second signals relating to the magnitude of a parameter to be controlled. The results of a first... | 04/23/1985 |
| 4495405 | Automatic control system including error processing loop Automatic control system for controlling the switching point of a device which operates in at least two modes of operation, provides for automatic modification of the error signal which controls the switching action of the device by processing in real tim... | 01/22/1985 |
| 4467182 | Control circuit A system for controlling the temperature at a location which is heated by a heater. The heater is intermittently energized by a source of electrical power in response to control signals from a temperature control circuit. The temperature control circuit i... | 08/21/1984 |
| 4441069 | Self-extinguishing load driving system A load and the main conductions paths of first and second TRIACs are connected in series between first and second power terminals across which an alternating voltage is applied. The first TRIAC is for controlling the power dissipated in the load and the s... | 04/03/1984 |
| 4383212 | Battery charger control device with D-C disconnect and A-C interrupt A battery charger has a control circuit portion and a power circuit portion with common terminals to connect to a battery desired to be recharged, the power circuit includes a transformer and rectifier to deliver at least partially rectified A-C current t... | 05/10/1983 |
| 4346339 | Apparatus for automatic regulation of AC power A closed loop phase control circuit. The circuit senses the temperature of a load circuit. It also senses the line voltage on each line of a multi-phase system. The sensed line voltage is full-wave rectified. Comparators for each phase compare an input si... | 08/24/1982 |
| 4206646 | Transducer combining comparator or converter function with sensor function A transducer is disclosed which provides a digital indication of a sensed analog condition without the need of an analog to digital (A/D) converter or a comparator. A condition responsive element having a true abrupt switching characteristic at a known br... | 06/10/1980 |
| 4162440 | Limit controller A solid state switching controller that switches power to a load when sensor controls indicate that a controlled parameter is outside the high and low limit set by the sensors. The controller power input is AC while the controller output is selectable as ... | 07/24/1979 |
| 4078393 | Control system for controlling the operation of a three-phase load The phases of a three-phase AC power supply are applied to a three-phase load, such as a motor, by respective ones of three triacs. Three alternating voltages, phase-displaced by 120°, appear across the triacs. When each alternating voltage is in its hal... | 03/14/1978 |
| 4061961 | Circuit for controlling the duty cycle of an electrostatic precipitator power supply A circuit for controlling the duty cycle of a two-stage electrostatic precipitator power supply. The circuit includes a switching device connected in series with the primary winding of the power supply transformer and a circuit operable for controlling th... | 12/06/1977 |
| 4042875 | Temperature transducer arrangement which supplies threshold voltages with the aid of a single sensor A temperature transducer includes first and second resistor bridges connected across a voltage source and first and second differential amplifiers. A first input terminal of the amplifiers are connected together to a common junction of the first resistor ... | 08/16/1977 |
| 4010411 | Power conversion apparatus An improved motor control system in which cooperative interaction of a simplified programmed IR compensation structure and economical thermally compensated speed reference-error comparator combination result in an improved polluted power notch-immune sync... | 03/01/1977 |
