Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 8183810 | Method of operating a motor Embodiments of the invention provide a method of operating a motor connected to a power device having a reduced current rating. The motor can include an increased torque constant and/or an increased back electromagnetic force constant in order to decrease a peak cur... | 05/22/2012 |
| 7369389 | Electronic trip unit for circuit breakers An electronic trip unit for a circuit breaker is disclosed. The electronic trip unit has a processing circuit, a real time clock chip, and a power source for powering the real time clock chip in the absence of current in the circuit breaker. The processing circuit i... | 05/06/2008 |
| 7342371 | System and method for detecting motor run condition A motor control system for detecting motor run condition comprises power switches for connection to an AC line for controlling application of AC power to the motor. An input receives a motor start command. A controller is connected to the input and controls operatio... | 03/11/2008 |
| 7301742 | Method and apparatus for accessing and activating accessory functions of electronic circuit breakers An electronic trip unit for a circuit breaker includes a programmed microprocessor and a module plug in removable signal communication with the microprocessor. The module plug includes a program identifier. The microprocessor recognizes the program identifier and ac... | 11/27/2007 |
| 7274548 | Abnormal current determining method, electronic apparatus, and computer program of same A cellular telephone 1 measures a current value after being turned on, and performs addition and subtraction of a predetermined margin to and from the measured value, and thereby sets up determination thresholds for an overcurrent and an undercurrent, namely,... | 09/25/2007 |
| 7259530 | Power output apparatus, motor driving method and computer-readable recording medium having program recorded thereon for allowing computer to execute motor drive control A control CPU generates, in response to a signal STON from a start key, a signal SE at H level and outputs the generated signal to a relay to render system relays ON. Accordingly, a DC power supply is connected between respective neutral points of three-phase coils.... | 08/21/2007 |
| 7203040 | Method and circuit breaker for reducing arc flash during maintenance in a low voltage power circuit Maintenance trip functions override the normal or specified trip functions of a low voltage circuit breaker to reduce pickup currents and/or time delays to effect faster trips, which reduces arc energy produced by faults during maintenance or testing on a live circu... | 04/10/2007 |
| 6998807 | Active sensing and switching device An active sensing and switching device for use in controlling current to a load, comprising a controller means (U1) for disconnecting the load from a power source by providing a switch-open control signal based on a signal indicating a sensed value of electri... | 02/14/2006 |
| 6646398 | Safety device for power window A power-window safety device which includes an annular magnet 21 mounted on a rotary shaft (9a) of a drive motor (9) for opening and closing a window glass of an automotive vehicle, and a magnetic flux sensor (20), disposed facing the annular magnet (21),... | 11/11/2003 |
| 6472836 | Method and arrangement for electrically controlling and regulating the movement of an electrically operated aggregate of a motor vehicle A method and apparatus for electrically controlling and regulating the movement of an electrically operated aggregate of a motor vehicle, such as a window lifter or sliding roof. A correlation variable for the adjustment force of the aggregate is measured... | 10/29/2002 |
| 6366041 | Railway switch machine motor control apparatus A motor control apparatus for a reversible motor of a railway switch machine includes a conditional power source having an output voltage. A motor control circuit includes inputs for inputting the voltage from the power source, inputs for inputting a norm... | 04/02/2002 |
| 6335602 | Squeeze protection system A squeeze protection system for movable parts of a vehicle, includes an operating switch for one or several parts to be moved, one or several actuators assigned to the operating switch, a control device for the actuator or the actuators which receives a s... | 01/01/2002 |
| 6298295 | Window object detection with start-up compensation A window obstruction identification system is tailored to better identify obstructions at start-up. The limit at start-up is set based upon the first peak value in a direction away from the direction expected for an obstruction. In the case of monitoring ... | 10/02/2001 |
| 6252365 | Breaker/starter with auto-configurable trip unit A combination circuit breaker/motor starter includes a circuit breaker trip unit having a microprocessor and at least one removably connectable contactor or other functional module. The functional module is encoded with an identifier, such that the microp... | 06/26/2001 |
| 6239610 | Arrangement for detecting jamming situations in electric drives In an arrangement for detecting pinching situations in electric drives, provided in particular for window and sunroof openers in motor vehicles, the voltage induced in the armature of the motor is used, the induced voltage being determined from the voltag... | 05/29/2001 |
| 6011370 | Servo-motor driving method A conventional method for driving a servo-motor carried out control by means of a current feedback loop, using a current sensor and an A/D converter; therefore, the number of parts was great, cost reduction was difficult and it was difficult to avoid cont... | 01/04/2000 |
| 5867357 | Dynamic protection circuit for a motor type load An express down vehicle window lift motor drive system in which an overcurrent detection circuit (10) interprets the flow of electrical power to the lift motor when the motor current exceeds a threshold which is set dynamically as a function of motor in-r... | 02/02/1999 |
| 5847535 | Active electronic damping for step motor Apparatus for electronically producing a torque dependent signal for a plural drive phase synchronous step motor, without the use of an accelerometer or other external feedback device, includes a circuit for detecting respective instantaneous terminal vol... | 12/08/1998 |
| 5661386 | Method for assessing in-service motor efficiency and in-service motor/load efficiency A method and apparatus for assessing the efficiency of an in-service motor. The operating characteristics of the in-service motor are remotely measured. The operating characteristics are then applied to an equivalent circuit for electrical motors. Finally... | 08/26/1997 |
| 5612601 | Method for assessing motor insulation on operating motors A method for monitoring the condition of electrical-motor-driven devices. The method is achieved by monitoring electrical variables associated with the functioning of an operating motor, applying these electrical variables to a three phase equivalent circ... | 03/18/1997 |
| 5596253 | Vehicle-mounted motor drive apparatus A vehicle-mounted motor drive apparatus which stops the rotation of a motor immediately after an object obstructs a movable part driven by the motor. The drive apparatus includes a motor drive device for selectively driving and stopping a motor, an electr... | 01/21/1997 |
| 5280227 | Electronic control for an appliance An electronic control for a motor which eliminates the motor centrifugal switch and more particularly a control for a domestic refuse compactor which permits the user to control the approximate full trash bag weight and obtain more compaction from a split... | 01/18/1994 |
| 4841404 | Pump and electric motor protector An electrical circuit for providing electrical energy to an electric motor which operates a liquid pump. The motor and the pump are adapted to be submerged in the liquid which is pumped by the pump. The circuit disclosed herein senses the phase angle betw... | 06/20/1989 |
| 4743816 | Microprocessor based motor protective relay with transition control Motor protection relay is taught in which a microprocessor is utilized in conjunction with a reduced voltage motor starter and the electrical motor system which it operates upon to cause the motor to start in stages. The microprocessor-based system infers... | 05/10/1988 |
| 4647825 | Up-to-speed enable for jam under load and phase loss A motor controller with means responsive to a motor condition for preventing termination of power to the motor in response to fault conditions when these fault conditions occur during start-up of the motor.... | 03/03/1987 |
| 4468597 | Method for regulating the power supply to a direct-current motor and a device for the application of said method The power supply to an electric actuating motor is regulated by reducing the differences between current intensity or voltage and a reference value. Two transducers measure the current intensity and the voltage. A selection stage chooses the higher of the... | 08/28/1984 |
| 4420787 | Water pump protector A water pump protector which includes electrical circuitry through which an electric motor is energized. The electric motor operates a water pump. The circuitry senses the phase angle between the voltage and the current applied to the electric motor. When... | 12/13/1983 |
| 4413213 | Electronic motor protection for variable speed motors A motor protection circuit which generates a signal having a value proportional to the magnitude of the input current of the motor and a motor speed signal having a value proportional to the difference between the rated motor speed and the actual motor sp... | 11/01/1983 |
| 4207503 | Battery supplied motor current control system with safety circuit A controlled switch 4 provides current pulses derived from a battery 3 to a motor 1, having a series field 2 under command of a control unit 8 which provides command pulses for repetitive closing of the controlled switch 4. Current through the motor is se... | 06/10/1980 |
| 3953777 | Control circuit for shutting off the electrical power to a liquid well pump A control circuit for turning off the power to the pump drive motor when the pump has exhausted the supply of liquid in the well. Means for sensing the instantaneous current to the pump motor and a circuit measuring the average current drawn by the pump d... | 04/27/1976 |
| 3931559 | Malfunction detector circuit for the use with a pump-off control circuit A malfunction detector circuit for use in conjunction with a pump-off control circuit which is periodically actuated by a timer and which monitors the current drawn by the drive motor of a liquid well pump. The malfunction circuit monitors the operation o... | 01/06/1976 |
