Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8185342 | Estimating rotor angular position and velocity and verifying accuracy of position sensor outputs Methods, system and apparatus are provided for estimating rotor angular position and angular velocity during a position sensor fault, and for verifying the accuracy or inaccuracy of a position sensor's outputs based on the estimated rotor angular position and angula... | 05/22/2012 |
| 8135560 | Sensor system for semiconductor manufacturing apparatus A chamber monitoring system may include a parallel architecture in which a single sensor control system is coupled to a number of different processing chamber control board sensor lines. In an illustrative embodiment, a single rotation sensor such as a tachometer ma... | 03/13/2012 |
| 8129056 | System and method for controlling an anode side recirculation pump in a fuel cell system A system and method for controlling the speed of a recirculation pump in an anode recirculation loop of a fuel cell system based on a predetermined ratio of fresh hydrogen to recirculated anode gas. The system uses a model to determine the volume flow of the recircu... | 03/06/2012 |
| 8095333 | Device for locating a right or left position of a tire and wheel assembly of a vehicle A location device is provided, in which the device is configured to be carried by a tire and wheel assembly so as to locate a right or left position of the assembly in a vehicle. The device includes two magnetic sensors with axes of maximum sensitivity; a measuremen... | 01/10/2012 |
| 8095334 | Procedure for estimating the torque transmitted by a friction clutch controlled by an actuator A process that estimates the torque transmitted by a friction clutch coupled to the shaft of a motor vehicle engine. The process includes determining the angular speed of the engine shaft and the torque developed by this shaft; calculating the difference between the... | 01/10/2012 |
| 7953575 | Electrical submersible pump rotation sensing using an XY vibration sensor When an electrical submersible pump motor runs, rotary vibrations occur in the same direction as the rotation of the motor. This vibration can be detected by an XY vibration sensor. Depending on the rotation direction, the vibration along the X-axis will be out of p... | 05/31/2011 |
| 7945419 | Electronic measurement of off-center run-out and reel-hub mismatch In a method of electronically measuring reel off-center run-out and reel hub mismatch, tape speed data related to a tape coupled with an operating drive reel is electronically measured. The tape speed data is correlated with drive reel rotation angles. The correlate... | 05/17/2011 |
| 7856337 | Method and apparatus for monitoring the rotational speed of the shaft of a gas turbine A method (and corresponding apparatus) for monitoring the rotational speed of the shaft of a gas turbine having a number of spaced blades on or rotating with the shaft. The invention compensates for the errors which arise from the relative movement of turbine blade ... | 12/21/2010 |
| 7840369 | Apparatus and method for correcting bias of gyroscope mounted on mobile robot An apparatus correcting a bias of a gyroscope that is mounted on a mobile robot and that measures an angular velocity of the mobile robot. The apparatus includes: at least one encoder respectively measuring a traveling velocity of a respective at least one wheel of ... | 11/23/2010 |
| 7840370 | Method and apparatus for monitoring the rotational speed of shaft Method and apparatus for monitoring the rotational speed of a shaft, in particular a shaft having a number of spaced features on or rotating with the shaft. Preferred embodiments of the invention are concerned with methods and apparatuses for processing signals in o... | 11/23/2010 |
| 7835883 | Method and device for measuring rotation speed of rotating equipment A rotation speed measuring device includes a position sensor outputting position signals indicating M (M >2) rotation positions of equal phase difference per rotation of the rotating equipment, a clock signal generator generating a clock signal; a counter counting t... | 11/16/2010 |
| 7761256 | Method and system for use in analyzing vibrations of a variable speed rotating body A method is provided for analyzing vibrations of a variable speed rotating body. The method includes producing a signal that is proportional to an acceleration of the rotating body and producing a plurality of pulses. Each pulse represents a revolution of the rotati... | 07/20/2010 |
| 7668690 | System and method for determining position or speed of a commutated DC motor with error correction A motor control system and method are provided for detecting current ripple in a commutated DC motor and further determining position and speed of the motor based on the detected ripple current. Ripples in the motor current are detected and a ripple frequency is cal... | 02/23/2010 |
| 7664615 | Method for determining a critical reduction in shaft speed in a work machine A method for determining a critical reduction in shaft speed in a work machine having at least one monitored shaft driven by a crankshaft of an engine includes determining an actual rotational speed of the crankshaft; determining an actual rotational speed of a firs... | 02/16/2010 |
| 7555401 | Sensorless measurement of positioning travel, especially on an electromotively operated parking brake The invention relates to a method for establishing the position of an actuating unit which is operated by an electric motor, in which a motor speed is determined from a motor model, the speed is integrated over a period of time and the position of the actuating unit... | 06/30/2009 |
| 7460975 | Method of sensing the motion of a solid, using an absolute measurement that is associated with a measurement calculated by double integration A method for measuring movement of a solid, using an absolute measurement associated with a double integration measurement. The method can be applied in particular to sensing movements of the human body and includes a series of measurement of the acceleration of the... | 12/02/2008 |
| 7444261 | Turning determination apparatus and turning determination method for vehicle An ECU executes a program that includes the steps of setting a vehicle speed to the minimum wheel speed among wheel speeds of four wheels of a vehicle; calculating a difference between the wheel speeds of right and left driven wheels; turning an abnormality flag on ... | 10/28/2008 |
| 7444262 | Reverse rotation detector for internal combustion engine A crank angle sensor outputs a pulse signal whenever a crankshaft rotates a predetermined angle. An ECU performs an elimination process on a sequence of pulse signals to obtain a remaining signal used to determine the crank angle. When the rotation speed of the cran... | 10/28/2008 |
| 7436172 | Angular speed detecting device using dual angular position signals to reduce noise An angular speed detecting device is composed of a magnetic sensor unit connected to a rotating object and including a permanent magnet and a pair of magnetic sensor elements to generate a pair of signals and an electric computing unit that calculates an angular spe... | 10/14/2008 |
| 7437272 | Systems and methods for self-synchronized digital sampling Systems and methods for self-synchronized data sampling are provided. In one embodiment, a system for capturing synchronous data samples is provided. The system includes an analog to digital converter adapted to capture signals from one or more sensors and convert t... | 10/14/2008 |
| 7437263 | Method and apparatus for controlling the machining of mechanical pieces A method and a relevant apparatus for controlling the machining of a piece (18,38) rotating in a numerical control machine tool (33) includes the steps of detecting instantaneous values (V(i)) indicative of the dimensions of the piece during the machin... | 10/14/2008 |
| 7428467 | Method for tangential force variation and angular acceleration fluctuation prediction in tires It is possible to significantly reduce a prediction error of the high-speed RFV and the high-speed TFV in a tire having a large PRO growth amount at high speed. Three or more sample tires are extracted from each lot. The PRO and RFV are measured and the least-square... | 09/23/2008 |
| 7418361 | Method of correcting speed of encoder and apparatus therefor A method of correcting the speed of an encoder and an apparatus therefor are provided. The method includes the steps of detecting an electrical signal corresponding to a driving speed of a motor, calculating driving speed values of the motor in sections of the elect... | 08/26/2008 |
| 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 |
| 7411370 | Vector controller of induction motor Provided is a vector control apparatus for an induction motor which is capable of obtaining stable rotation in a short period of time for adjustment even at the time of low-speed operation by increasing the SN ratio of an output voltage to suppress the arithmetic er... | 08/12/2008 |
| 7401001 | Position determining A position determining system for determining a position of a rotor of a rotating motor has sensors that are coupled to the rotor. The sensors generate, in response to a rotation of the rotor, a quadrature signal that has sine and cosine components. The position det... | 07/15/2008 |
| 7401000 | Acoustic vibration analyzing apparatus and acoustic vibration analyzing method, program for analyzing acoustic vibration, and recording medium, readable by computer, on which program for analyzing acoustic vibration is stored The present invention provides an acoustic vibration analyzing apparatus for carrying out acoustic vibration analysis by picking up data of sounds generated due to rotation of a plurality of gears and data of the number of revolutions of a gear selected from a plura... | 07/15/2008 |
| 7395177 | Method for monitoring tire pressure variation of automobile tire and system for realizing the same A method for monitoring tire pressure variation of automobile tires and a system of implementing thereof, which measures and obtains rotation speeds of individual automobile tires as reference values, and compares these reference values with the current rotation spe... | 07/01/2008 |
| 7386415 | System and method for increasing sensor resolution using interpolation Systems and methods for increasing sensor resolution using interpolation are described. One described method includes receiving an analog sensor signal associated with a coding surface; deriving a quadrature signal based at least in part on an analog threshold volta... | 06/10/2008 |
| 7372940 | Radiation therapy system with risk mitigation An X-ray therapy system with equipment for reducing risk that the radiation applied to a patient is other than what is intended. A radiation check is made in which a signal indicative of the radiation to be applied is compared with a reference signal, and/or a confi... | 05/13/2008 |
| 7369667 | Acoustic image localization signal processing device An acoustic image localization signal processing device capable of localizing an acoustic image in an arbitrary direction includes: a sound source data storage unit that stores second sound source data obtained by subjecting first sound source data to signal preproc... | 05/06/2008 |
| 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 |
| 7366633 | Signal processing methods A process for extracting at least one variable associated with a periodic signal (S, S′) including a possible continuous component, a sinusoidal fundamental component and possible harmonics. Numerical samples of the periodic signal (S, S′) are formed and special... | 04/29/2008 |
| 7358480 | System and method for re-synchronizing an access barrier with a barrier operator A system for re-synchronizing an access barrier with a barrier operator comprises an access barrier, and a barrier operator to profile and monitor the manual and automatic movements of the access barrier. The barrier operator comprises a controller, a memory, a moto... | 04/15/2008 |
| 7348770 | Electronic device for interrupt signal control to acquire encoder speed information and a method thereof An electronic device for acquiring encoder speed information and a method for implementing the same are provided, wherein the electronic device includes an encoder for electrically outputting an encoder signal corresponding to a driving speed, a processor unit for o... | 03/25/2008 |
| 7349780 | Steering angular velocity computing device and method A steering angular velocity computing device detects a change in a steering angle, measures a required time from a time when the steering angle changed until a time when the steering angle next changed, and computes, after the detector has detected a change in the s... | 03/25/2008 |
| 7339338 | Method for operating a door and a door drive for carrying out this method A door, especially a sectional door, is operated with the use of a drive unit with a drive gear, a clutch, and a position-detecting unit. The position-detecting unit detects the direction of rotation of the drive gear, detects the number of revolutions of the drive ... | 03/04/2008 |
| 7340368 | Determination of dynamic axle loads and/or wheel loads of a wheel vehicle For determination of dynamic axle and/or wheel loads of a wheel vehicle (20), wherein for said wheel vehicle (20), at least two linear transversally oriented with respect to each other accelerations and three rotation rates of a rotation movement aroun... | 03/04/2008 |
| 7340369 | Detection device for decreased tire pressures and method thereof A device, and an analogous method and program, for detecting whether different tires are mounted on the left and right driving wheels of a vehicle and accurately detecting decreased tire pressures. The device detects the rotational speeds of wheels mounted on the ve... | 03/04/2008 |
| 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 |
