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Actor Zeppo Marx patented a "Cardiac Pulse Rate Monitor" in 1969.
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| Number | Title | Issue Date |
| 8063590 | Method and apparatus for detecting blocking of a direct current motor Both a method and a use by this method of an apparatus for detecting blocking of a direct current motor (10), in particular a direct current motor (10) for a blower of a motor vehicle, is presented. The direct current motor (10) is deactivated b... | 11/22/2011 |
| 7141946 | Method and apparatus for providing optimal acceleration feedback A method and apparatus for use with a motor controller that receives a command velocity and that applies voltages to drive a motor at the command velocity, the apparatus comprising a dual inertia lost motion assembly including a motor and a load couplable to the mot... | 11/28/2006 |
| 7026775 | Method and apparatus for controlling speed of moving body Method and apparatus for controlling a moving speed of a moving body, wherein at least one transient target speed value in addition to a final target speed value is used to control the moving speed in an accelerating period between a moment of initiation of a moveme... | 04/11/2006 |
| 6980322 | Image forming apparatus in which light emitted by an exposing light source is conducted by an optical waveguide An image forming apparatus includes a light source for emitting light constituting an optical signal, an optical waveguide for conducting the light emitted by the light source and an engine portion for receiving the light conducted by the optical waveguide. The engi... | 12/27/2005 |
| 6040666 | Machine tool control system and machine tool control method, and detection system and detection method therefor A machine tool has a spindle with a tooling body mounted thereon, a detector for detecting an acceleration time for the tooling body to reach from a rotation start to a predetermined rpm, a controller for controlling an rpm of the spindle under a lowered ... | 03/21/2000 |
| 5808431 | Motor rotational speed control apparatus A motor rotational speed control apparatus is constructed by a control unit for performing an instruction to accelerate a rotational speed of a motor, an instruction to decelerate, or an instruction to maintain a rotational speed, a driving unit for drivi... | 09/15/1998 |
| 5471353 | Disk drive employing multi-mode spindle drive system A disk drive system for use in limited power applications is disclosed. The disk drive includes a spindle motor having two or more windings, along with a spindle motor driver which can drive the spindle motor in any of a unipolar, bipolar or tripolar mode... | 11/28/1995 |
| 5457365 | Disk drive power management system A computer having a hard disk drive includes a battery voltage monitor which establishes a shut down condition of the computer if the supply voltage falls below a chosen level VL. Upon start up of the hard disk drive motor, current through the ... | 10/10/1995 |
| 5153492 | Servo amplifier The servo amplifier is used for driving power transistors supplying current to a D.C. servo motor. The servo amplifier includes a control signal input; a tach signal input; circuitry coupled to the inputs for creating an error signal between the control s... | 10/06/1992 |
| 4585981 | Device for driving motor-operated closure parts A device for driving a motor-operated closure part for an opening, especially on a motor vehicle, having a protective circuit for interrupting the closing movement when there is an indication that an object may be obstructing closure of the opening. A spe... | 04/29/1986 |
| 4300079 | DC Motor control system A DC motor control system which has means for detecting the rise and fall of a drive command signal to generate an ON ACCELERATION/DECELERATION signal and means for generating a current limit signal for driving a DC motor by the ON ACCELERATION/DECELERATI... | 11/10/1981 |
| 4297623 | System for controlling a separately excited constant load DC electric motor A separately excited constant load DC electric motor is controlled in resse to a source of current for the desired motor speed. Current from the source applied to the motor armature is modified by a motor loss simulator circuit responsive to the source. ... | 10/27/1981 |
| 3938013 | D. C. Motor control system effecting changes in the connections of the armature and variations in current flow through the field A d.c. motor control system includes a pair of armature windings mounted on a single rotor or on a pair of mechanically coupled rotors, and a field winding or windings. The system includes switch means operable to effect a change in the electrical connect... | 02/10/1976 |
