Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7856338 | Apparatus and method for detecting a reversion of direction of a relative movement An apparatus for detecting a reversion of direction of a relative movement between a periodic scale for defining a periodic field and a field sensor. The field sensor outputs first and second sensor signals. The first sensor signal is advanced from the second sensor... | 12/21/2010 |
| 7774157 | Checking of turbomachine blades A method of checking turbomachine blades is presented that may be implemented using a computer and a measuring device. Turbomachine blades compatible with embodiments of the method have a profile including a centerline, suction face, pressure face, leading edge and ... | 08/10/2010 |
| 7543486 | Method of estimating the duration of target wheel teeth A method for determining as a function of time the angle of rotation of a crankshaft by estimating the position of missing teeth on a target wheel is disclosed which has application to engine control. A sensor acquires, as a function of time, a periodic signal compr... | 06/09/2009 |
| 7539594 | Method and apparatus for geometric rotor stacking and balancing A computer method or corresponding system for optimally balancing a rotor assembly. The computer system defines a theoretical centerline based on a mathematical model of the rotor assembly. For each disc or component of the rotor assembly, the invention system calcu... | 05/26/2009 |
| 7433795 | Tm method for controlling dynamic apparatus and apparatus thereof Provided is a method and apparatus for controlling the precision of the rotation angle of a rotation of a dynamic apparatus, including the step of determining a conversion factor of a gyroscope installed in the dynamic apparatus to control the rotary movement to be ... | 10/07/2008 |
| 7415363 | High resolution torque measurement on a rotating shaft with movement compensation An apparatus for determining the torque imposed on a rotatable shaft. The shaft has at least four paired probes, paired horizontal probes and paired vertical probes. The horizontal probes are positioned 90 degrees apart from the vertical probes. If the shaft moves h... | 08/19/2008 |
| 7386385 | System for recognising the lane-change manoeuver of a motor vehicle System for evaluating the traffic environment of a motor vehicle and for influencing the speed of the motor vehicle in its own traffic lane, comprising an electronic control unit, which is connected to a signal transmitter that produces a signal characteristic of th... | 06/10/2008 |
| 7366636 | Rotational angle detector A rotational angle detector for detecting the rotational angle of the rotor in a wide range without requiring dark current. A first detection gear including an m number of teeth and a second detection gear including an L number of teeth are each engaged with a main ... | 04/29/2008 |
| 7357041 | Rotation detection device Torque ripple of a motor due to a rotation detection device is reduced. A periodicity gain multiplier 51 multiplies the rotation angle θ of a detection target by a ripple periodic number m per rotation of the detection target. An adder 53 adds a phase... | 04/15/2008 |
| 7328122 | Speed sensor A speed sensor includes a magnetic pickup generating a cyclical output based upon passing teeth of a rotating gear. A counter counts the number of clock pulses that are generated during a measurement period of the cyclical output. The measurement period, in terms of... | 02/05/2008 |
| 7324919 | Apparatus for analysing the condition of a machine An apparatus for analysing the condition of a machine having a rotating shaft, includes: at least one input for receiving measurement data from a sensor for surveying a measuring point of the machine, the measurement data being dependent on rotation of the shaft; an... | 01/29/2008 |
| 7319910 | Method and device for controlling a movement of a movable machine element of a machine tool or production machine A method and device for controlling a movement of a movable machine element of a machine tool or production machine with at least two drive axles are disclosed. At least one mechanical characteristic frequency is determined for each drive axle of the machine, and th... | 01/15/2008 |
| 7308373 | Method for determining a vehicle reference velocity A velocity and acceleration are measured (14) in a method for determining a vehicle reference velocity, said vehicle reference velocity being used for determining and selecting a suitable transmission ratio. If a measured acceleration (aist) exceed... | 12/11/2007 |
| 7283923 | Method of speed measure on turbo superchargers of internal combustion engines by means of vibrations analysis and equipment to perform it A method of determining speed of rotation of a motor is provided. The method involves collecting samples with a measuring sensor at a sampling frequency, set on the basis of mechanical vibration of the motor, for the duration of a measurement period and storing the ... | 10/16/2007 |
| 7283924 | Method for automatically determining the fitting positions of tires in a motor vehicle The present device relates to a method for automatically determining the installation positions of wheels in a motor vehicle. The motor vehicle has a direct measure tire pressure monitoring system includes individual wheel tire pressure measuring devices and transmi... | 10/16/2007 |
| 7265507 | Angular position and velocity estimation for synchronous machines based on extended rotor flux A method of correcting the determination of extended rotor flux using a lag function and a correction algorithm that closely approximates a pure integrator function to correct for lag function errors that can extend the EFS control down to dynamoelectric machine spe... | 09/04/2007 |
| 7266567 | Absolute encoder and absolute value signal generation method An absolute encoder comprising a first memory operable to store a first absolute value signal produced every constant time period, the absolute value signal representing an absolute value position. A second memory stores a second absolute value signal produced in a ... | 09/04/2007 |
| 7260509 | Method for estimating changes in product life resulting from HALT using quadratic acceleration model A method provides early estimation of product life using accelerated stress testing data. In an embodiment, data measured from a product operating in a first, high-stress environment is used to predict how long the product will operate in a second, normal operating ... | 08/21/2007 |
| 7248991 | Method and device for detecting a rotational speed, especially the rotational speed of the wheel of a vehicle The invention relates to a method and an apparatus for measuring a rotational speed, in particular a rotational speed of a wheel of a motor vehicle, by means of a speed sensor, wherein the speed sensor produces an output signal characterizing the actual rotational s... | 07/24/2007 |
| 7222044 | Rotating speed detecting apparatus A rotating speed detecting apparatus has: a bearing sensor configured to detect rotation of a motor and output detection pulses whose frequency depending on a rotating speed of the motor; and a calculating unit configured to receive the detection pulses from the bea... | 05/22/2007 |
| 7219031 | Rumble strip responsive systems: discrimination of types of rumble strips There are basically two types of rumble strips: shoulder/center rumble strips and in-lane rumble strips. In an embodiment of the invention, there is a device that automatically identifies the type of rumble strip with which a vehicle tire is in contact with. The dev... | 05/15/2007 |
| 7200519 | Analysis system for analyzing the condition of a machine A system for analyzing the condition of a machine having a rotating shaft and a machine body with a measuring point includes a client part communicating with a supplier part computer via a communications network. The client part includes a sensor attachable at the m... | 04/03/2007 |
| 7190142 | Apparatus and method for controlling fan drive in computer system Embodiments of an apparatus and method can control a fan drive in a computer system. Such embodiments of apparatus and methods can alternately output a plurality of pulse width modulation (PWM) control signals at a predetermined time ratio and variably control a rot... | 03/13/2007 |
| 7184654 | Semiconductor device control apparatus and method In a control apparatus for a motor, which rotates a fan, a semiconductor device is connected to the motor in series to drive the motor. An analog driver circuit drives the semiconductor device with an analog voltage. A PWM control circuit drives the semiconductor de... | 02/27/2007 |
| 7167814 | Analysis system for analyzing the condition of a machine An apparatus for analyzing the condition of a machine, comprising: at least one input for receiving measurement data from a sensor for surveying a measuring point of the machine; data processing means for processing condition data dependent on said measurement data;... | 01/23/2007 |
| 7096136 | Method for detecting rotational speed In a method for detecting rotational speed of an internal combustion engine (1), a sector wheel (4) which is driven by the internal combustion engine (1) is scanned, the run of a specific segment of the sector wheel is detected, the duration of ... | 08/22/2006 |
| 7072790 | Shaft sensorless angular position and velocity estimation for a dynamoelectric machine based on extended rotor flux A shaft sensorless rotor angular position and velocity sensing system for a ynamoelectric machine that includes: a reference frame transformation function for transforming measured currents and potentials applied to a stator of the dynamoelectric machine to a two-ph... | 07/04/2006 |
| 7068191 | Method for determining the numerical value for the duration of a periodically repeated pulse signal, and device for carrying out said method The invention concerns a method for determining a numerical value for the duration of a periodically repeating pulsed signal. This method comprises the following steps: a) at time intervals, the period length of the signal is determined; b) at time intervals, a char... | 06/27/2006 |
| 7060969 | Rotating machine having rotation sensors Three rotation sensors circumferentially arranged at 90 degree intervals in a disk code wheel attached to a motor's output shaft respectively output a signal corresponding the rotational speed of the wheel. An error component of one period (one-periodic component) o... | 06/13/2006 |
| 7054783 | Rotational speed detector with ripple compensation The rotary detector according to this invention comprises a rotary detector unit C1, C1′ which detects rotary motion of a rotor; and a rotary calculator unit C2, C2′, C2″ comprising a rotation angle detector, which detects th... | 05/30/2006 |
| 6959234 | Process for monitoring the condition of motor vehicle wheels A process and device for monitoring the state of a wheel of a motor vehicle in which an output signal of a sensor is converted into an essentially rectangular pulse signal. A respective duration of the pulse is measured; and an especially weighted average between th... | 10/25/2005 |
| 6949960 | Semiconductor integrated circuit comprising functional modes An integrated circuit device includes a pin for receiving a DC voltage component signal. The device includes a signal source for applying an AC signal to the pin, a buffer for converting the AC signal into a digital signal, and a digital detector for detecting a fre... | 09/27/2005 |
| 6925413 | Method and system for detecting a spatial movement state of moving objects A method and a system for detecting the spatial movement state of moving objects, e.g., vehicles. Due to a, for example, non-cartesian arrangement of four rotational rate sensors and/or acceleration sensors, it is also possible to obtain a redundant signal in additi... | 08/02/2005 |
| 6909257 | Method and device for correcting estimated speed of induction motor and its device A magnetic flux estimator 7 of a controller used for sensorless vector-controlling of an induction motor computes an estimated speed ωrest and an estimated phase θlest from input α-phase and β-phase voltage instructions Vα | 06/21/2005 |
| 6889161 | Method for recognizing a change in lane of a vehicle A method of detecting a lane change of a subject vehicle (20), having a locating device (10) which uses angular resolution for locating vehicles (VEH1, VEH2, VEH3) traveling in front, and a device (44) for determining the ya... | 05/03/2005 |
| 6879938 | Tire burst prediction device A tire burst predicting device which can predict occurrence of bursting of a tire and gives an alarm properly is provided. A break point frequency is estimated on the basis of time series data of wheel speed detected at a wheel speed sensor from frequency response o... | 04/12/2005 |
| 6801873 | Analysis of rotating machines System and method for analyzing an input signal acquired from a physical system with a rotating element. A tachometer signal is received comprising rotation speed information for the rotating element. A time sequence is determined using the tachometer signal, compri... | 10/05/2004 |
| 6795792 | Continuous flow method and system for placement of balancing fluid on a rotating device requiring dynamic balancing Methods and systems for continuously transferring balancing mass to a rotating system or rotating device in order to dynamically balance the rotating system or rotating device are disclosed. A flow of balancing mass can be continuously provided to the rotating syste... | 09/21/2004 |
| 6778938 | Fan speed detection in the presence of PWM speed control A circuit is arranged to pulse-width modulate the duty cycle of a power supply signal that is used to control the rotational speed of a fan in a temperature-controlled system. The control system includes an edge detector for monitoring a tachometer signal that is pr... | 08/17/2004 |
| 6704683 | Direct velocity estimation for encoders using nonlinear period measurement A method and apparatus for providing a direct velocity of a moving object using nonlinear period measurement. A pulse signal from an encoder indicates the detection of a passage of a point on a moving sensor element, such as a mark on an encoder disk. A c... | 03/09/2004 |
