Celebrity Inventors
Actor Marlon Brando has four patents, all named "Drumhead tensioning device and method."
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| Number | Title | Issue Date |
| 7311081 | Electronic throttle control system with integrated controller and power stage One embodiment includes an apparatus comprising a closed loop feedback controller and a power output stage to couple to the closed loop feedback controller. The closed loop feedback controller and the power output stage are combined to form a single element. ... | 12/25/2007 |
| 7126414 | Arrangement and method for controlling an amplifier circuit corresponding to energy uptake in the amplifier circuit An amplifier circuit (1) is disclosed, wherein with a view to reducing the leakage power of the amplifier circuit (1) a current path (6) is provided between a first output terminal (A1) and a second output terminal (A2) of the ampl... | 10/24/2006 |
| 7116019 | Mesh connected electrical rotating machine with span changing An electrical rotating apparatus is provided that has variable impedance. This is achieved by connecting one of the polyphase components of the apparatus in a mesh connection. The spanning value, L, of such a mesh connection may be varied by changing the harmonic co... | 10/03/2006 |
| 6992452 | Dynamic current limiting A system and method for generating commands for current subject to dynamic determinations of a limit. In one embodiment, the dynamically determined limit is a function of power dissipation in a component estimated from a measured current level and as a function of a... | 01/31/2006 |
| 6943514 | Motor control circuit for supplying a controllable driving current For applying a driving current to a motor, an H-bridge circuit is constructed by a first and a second switching unit and a first and a second linear unit. An error amplifier generates an error signal representative of a difference between the driving current detecte... | 09/13/2005 |
| 6798859 | Branch amplifier card A branch amplifier card for a nuclear reactor control rod drive control system is provided. The control system includes a control processor, a plurality of transponder cards arranged in clusters with each cluster under the control of a branch amplifier card. The bra... | 09/28/2004 |
| 5023536 | Servo-controller A deviation comparator (10) compares an output signal of a deviation detector (6) with a set limit value to anticipates a runaway, and if the runaway is judged thereby, an object unit (12) is isolated by a switch circuit (11), thereby to prevent destructi... | 06/11/1991 |
| 4885517 | Voice coil actuator positioning amplifier A signal amplifier including a bridge output stage, a comparator stage arranged to control a first part of the output stage in accordance with the polarity of an input signal, and a modulating stage arranged to control a second part of the output stage in... | 12/05/1989 |
| 4851753 | Proportional motor control circuit A proportional control circuit for the direction and precise speed control of D.C. electric motors such as those used to drive camera tilt/pan mountings. The circuit applies current to D.C. motors in a push/pull proportional scheme whereby slewing speed i... | 07/25/1989 |
| 4812778 | Isolation amplifier An isolator for connection between an informational signal source and a high voltage controlled load may be used with numerous combinations of different input signal type and magnitude and output signal requirements. The compensation for input and output ... | 03/14/1989 |
| 4794312 | Method and apparatus for controlling a servo motor A servo motor control system for accurately pointing and controlling the speed of a servo motor using a low resolution PWM signal. A PWM command value given in each control operation cycle for driving other servo motors is divided, and output to a power c... | 12/27/1988 |
| 4786822 | Load control system A load control system (10) generates a periodic failsafe signal (CO) and two control signals. The failsafe signal (CO) is used to drive a charge (20) pump which acts as a voltage multiplier to generate an enable signal. A DC bridge circuit (30) includes f... | 11/22/1988 |
| 4777382 | Pulse width logic/power isolation circuit A circuit is disclosed which provides power isolation between the initializing and driven circuit, allowing the logic of a wide pulse width signal to be effectively transmitted across pulse transformers and faithfully reproduced.... | 10/11/1988 |
| 4703238 | Amplifier system for D.C. motor An amplifier system for energizing a d.c. motor from a power source in response to an error signal includes a bridge circuit including a first switching transistor pair for supplying a first current from the power source through the motor in one direction... | 10/27/1987 |
| 4616305 | AC/DC power MOSFET reversing H-drive system A power MOSFET reversing H-drive system having a first pair of N-channel and P-channel MOSFETs (Q1,Q2) connected in series with a load (LD1,LD2) to a power supply source (T1) and a second like pair of N-channel and P-channel MOSFETs (Q3,Q4) connected in s... | 10/07/1986 |
| 4551776 | Automatic reference adjustment for position error signal on disk file servo system A servo system which generates a position error signal (PES) provides for periodically calibrating the magnitude of the PES to increase or decrease its magnitude as required by modifying the gain of a variable gain amplifier in the servo loop.... | 11/05/1985 |
| 4514666 | Pulse width modulation d.c. servo motor driving circuit By using the fly-wheel current effectively, the d.c. servo motor current can be rapidly decreased when the circuit becomes non-driving state or the driving polarity is changed, and the inexpensive circuit of the high performance driving circuit, in which ... | 04/30/1985 |
| 4506203 | Small deadband servocontrol system A circuit for controlling the position of a driven member is disclosed which includes a control circuit for controlling the application of electrical power to a motor and a circuit element operable for generating position error signals corresponding to th... | 03/19/1985 |
| 4496890 | Antenna rotator controller Controller for an antenna rotator having a rotatable member on which is mounted an antenna to be rotated to various headings. Switching circuitry selectively energizes a motor in the rotator to rotate the member in either of two, opposite directions. Ante... | 01/29/1985 |
| 4482847 | Electrically-controlled rotary actuator A motor-driven rotary actuator includes an electric drive motor adapted to be configured for providing one of a plurality of output torques and power transmission means including a rotatable output shaft. The transmission means is coupled to the drive mot... | 11/13/1984 |
| 4481452 | Control circuit for electromagnetic devices In a control circuit, which has a current switching-over circuit including at least four switching transistors for controlling a current flowing through an electromagnetic device, the control circuit has driving circuits each of which drives the switching... | 11/06/1984 |
| 4472664 | Cross-linked switching circuit for producing a two-phase current drive for a bipolar brushless motor and a brushless motor including said switching circuit A switching circuit for producing a current drive for a bipolar brushless motor in solid-state form comprising cross-linked switching transistors which are controlled by control transistors which in turn are controlled by a decoder. The decoder may have p... | 09/18/1984 |
| 4463296 | Vehicle motor driving circuit A driving circuit for use in controlling a motor for controlling an air mixing door, an inner and surrounding air change-over door and a mode setting door and the like used in a vehicle air conditioning device, or a motor used in opening or closing of win... | 07/31/1984 |
| 4458188 | Industrial robot having a function for controlling a current of a motor for driving Disclosed is an industrial robot having a function for controlling a current of a motor for driving, which comprises a circuit (41) for summing a plurality of input signals to which input signals of speed command, speed feedback, current command and curre... | 07/03/1984 |
| 4432033 | Power source for a solenoid controlled fluid pressure device A power source for a pair of solenoid coils selectively acting in opposite directions on a single armature. The source includes a selectively variable D.C. power source selectively energizing either coil with opposite magnetic polarity and a dither signal... | 02/14/1984 |
| 4371824 | Base drive and overlap protection circuit An inverter (34) which provides power to an A. C. machine (28) is controlled by a circuit (36) employing PWM control strategy whereby A. C. power is supplied to the machine at a preselectable frequency and preselectable voltage. This is accomplished by th... | 02/01/1983 |
| 4358724 | Solid state servo amplifier for a D.C. motor position control system A linear solid state servo amplifier operated from a low voltage source and which develops a voltage across the servo motor equal to the source voltage diminished only by the saturation voltages of two of its output transistors has a bridge output stage o... | 11/09/1982 |
| 4353021 | Control circuit for a pulse motor A control circuit is disclosed for operating a pulse motor which contains a first winding and a second winding. A first bridge can connect the first winding to a power source in two directions and can also disconnect the first winding therefrom. Likewise,... | 10/05/1982 |
| 4349769 | Incremental integrator and the resulting servosensors Precision incremental-output integrator of the type comprising: an operational amplifier mounted as analog summing integrator, which sums currents I1 and I2 at the integrator input, characterized by the fact that current I2 | 09/14/1982 |
| 4339701 | Switching frequency stabilization and load fault detection in switching amplifiers The switching amplifiers of the prior art improved by a variable hysteresis in the comparator circuitry of said amplifier. Said variable hysteresis is controlled by the power supply voltage and a frequency sensitive feedback circuit. If the amplifier load... | 07/13/1982 |
| 4337426 | Stabilized servo motor positioning apparatus A photoelectric transducer (14) produces first and second periodic signals (A), (B) which are 90° out of phase with each other in response to rotation of a servo motor shaft (12a). The first and second signals (A), (B) are differentiated, directly full w... | 06/29/1982 |
| 4303875 | Device for the remote control of the angular position of an aerial rotor A device for the remote control of the angular position of an aerial rotor comprising a d.c. motor for the rotation of the rotor and a drive circuit adapted to cause the rotation of the motor in one direction when it receives as input a d.c. voltage highe... | 12/01/1981 |
| 4300080 | Power driver control circuit for servo actuator A power driver control circuit (38) provides control signals (44, 46, 48, 50, 52, 54) for switching transistors in a power driver (56) for an electromagnetic actuator (11) of the type used for controlling a servo head (12) in a closed loop servo system. T... | 11/10/1981 |
| 4290000 | Power amplifier with current limiter circuit A power amplifier is disclosed for controlling the current flow through a load, such as a d-c servo motor. The amplifier includes a plurality of switching elements connected in bridge fashion with the load and a predetermined power source for coupling the... | 09/15/1981 |
| 4242560 | Servo feed system for an electrical discharge machining apparatus The servo circuit is operable both in a dual and in a single mode and includes an analog gate for multiple gap inputs. Dual operation is required where more than one gap is involved such as in the situation where multiple electrodes are carried by a commo... | 12/30/1980 |
| 4217531 | Digitally controlled gain reduction in a positioning system A system is disclosed for positioning an instrumentality over a predetermined range in response to a digitally coded position signal. To effect a controlled reduction in the instrumentality movement, an operational amplifier is provided having a feedback ... | 08/12/1980 |
| 4206394 | Motor control circuit A motor control circuit of the Wheatstone bridge type is described for driving a direct current motor, selectively, in one direction or the other for the general purpose of automatically setting the diaphragm of a photographic camera in accordance with th... | 06/03/1980 |
| 4204143 | Pulse width modulated power amplifier for direct current motor control A solid state electronic circuit for controlling a reversible direct curr motor from a voltage source such that it may be rotated in either direction. The reversible direct current motor is connected into a bridge circuit with semiconductor switching ele... | 05/20/1980 |
| 4189732 | Motor actuating circuitry Motor driver/control apparatus employs a motor speed regulating amplifier configuration, e.g., two push-pull power amplifiers operable responsive to a motor speed-direction command input signal, and having the motor differentially connected between amplif... | 02/19/1980 |
| 4185235 | Servo amplifier providing current torque and dynamic parameters A servo amplifier system includes first and second operational amplifiers, with the second amplifier having a low output impedance. A torque coil is connected directly from the output circuit of the first amplifier to the input circuit of the second ampli... | 01/22/1980 |
