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 |
| 7253610 | Self-powered bicycle signal output device and display apparatus using same A bicycle signal output device comprises a magnet structured to be mounted to one of a first part and a moving part of a bicycle, a coil structured to be mounted to the other one of the first part and the moving part of the bicycle, and a signal generating unit that... | 08/07/2007 |
| 7230418 | Flutter reduction apparatus and method A tachometer circuit includes a flutter reduction circuit and a tachometer. The tachometer circuit cancels pointer flutter in the tachometer without adversely affecting pointer response. ... | 06/12/2007 |
| 7173409 | Image forming device An image forming device includes a device frame and a photoconductive drum. The device frame includes a driving device, a driving gear that transmits a driving force from the driving device, and an urging member that supports the driving gear in a manner capable of ... | 02/06/2007 |
| 7159295 | Method of making a miniature electric motor A miniature PMDC motor 10 has a permanent magnet stator comprising two arcuate ceramic magnets 20 fitted to a can-like housing 11 and circumferentially separated by interdisposed rubber magnets 21 wedging or nipping the ceramic magnets | 01/09/2007 |
| 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 |
| 6954012 | Permanent electric motor with a speed sensor A PMDC motor with a speed sensor has a cup-like deep drawn rear housing. The speed sensor is located at the bottom of the housing and has an annular base plate supporting a coil with a steel pin core. The coil is connected to two terminals of a connector mounted on ... | 10/11/2005 |
| 6859030 | Method for determining the rotational position of the drive shaft of a direct current motor A method for determining the position of an element driven along a travel segment by a shaft of a motor includes counting current ripples detected in an armature current signal of the motor as the motor shaft rotates to drive the element. A first time interval betwe... | 02/22/2005 |
| 6456063 | Self compensating control circuit for digital magnetic sensors A self-compensating control circuit for use with a magneto-resistive sensor. The control circuit includes a first stage amplification and offset function that removes a DC component from the input signal and maximizes an AC component of the input signal w... | 09/24/2002 |
| 6393912 | Electromagnetic method of the angular displacement monitoring A method and apparatus is disclosed for monitoring an angular displacement, such as angle position and the direction of displacement. The method and apparatus includes at least one resonator placed in proximity to a electrodynamic profile and exciting wit... | 05/28/2002 |
| 6018240 | Cross-coil measuring meter driving device having a period range judging means and an after-change supply prevention means An after-change supply prevention unit prevents a cross coil from being supplied with a driving pulse signal with a duty ratio corresponding to a deflection angle calculated based on a period of a running pulse in a duration in which a period range judgin... | 01/25/2000 |
| 5825338 | Instrument display method and system for passenger vehicle An instrument display method and system for use in a passenger vehicle has a number of advantageous features including particularly novel, compact, inexpensive and inherently stable electric motors. A first motor includes a rotor assembly having a shaft a... | 10/20/1998 |
| 5757676 | Method for measuring speed A method for measuring rotational speed in which a plurality of signal sources disposed along the periphery of a rotating system is monitored by a sensor, and the signals generated by the sensor are added by a counter to form a speed signal sum N. An asso... | 05/26/1998 |
| 5633062 | Method of manufacturing rotation sensor and structure of rotation sensor A method of manufacturing a rotation sensor can effectively prevent a sensor element from moving during a resin molding process for forming a resin portion that covers the sensor element to provide excellent waterproofness and airtightness. During a first... | 05/27/1997 |
| 5497078 | Method and system for driving an air core gauge with improved pointer resolution A method and system for driving an air core gauge whereby pointer resolution of an air core gauge is improved across a full range of motion. The method including the steps of generating a first gauge control signal responsive to a signal, the first gauge ... | 03/05/1996 |
| 5489842 | Method and apparatus for determining the rotational position of a magnetic rotor relative to current carrying coils utilizing magnetic coupling between coils An apparatus includes a rotatably mounted magnetic rotor, a first coil mounted in proximity of the magnetic rotor, the first coil mounted such that, if the coil is flowing with electric current, the magnetic rotor is within immediate proximity of at least... | 02/06/1996 |
| 5448163 | Meter drive including a timer for generating update cycles at a frequency larger than the input clock pulses and digital filtering There is disclosed a meter driving device which can perform a smooth indication through a simple process in response to an input pulse even if the frequency of the input pulse is relatively low. An edge detector generates a one-shot pulse each time the edge of... | 09/05/1995 |
| 5369360 | Recessed paddle wheel speed measuring device for personal watercraft A speed measuring device for use with shallow draft jet pump propelled boats includes a magnetized paddle wheel with diametrically opposed paddles having similar charges and adjacent paddles having opposite charges which is mounted in a housing adjacent a... | 11/29/1994 |
| 5315536 | Meter driving system A meter driving system measures a period of input signals, and operates meters based on the measured period data. When no period data arrive in a preset period of time after the last period data, the lapsed time is treated as the period data so as to rene... | 05/24/1994 |
| 5309087 | Air core gauge, multi-frequency pulse width modulator system therefor A pulse-width modulation system provides means for controlling dual-coil, air-core gauges at a various rates over 360 degrees. The system moves a dial needle from one octant of the gauge to the next in response to coded data representing measurands by hol... | 05/03/1994 |
| 5121347 | Apparatus for manipulating triangular wave signals used to drive a gauge having a pair of coils arranged in quadrature An apparatus for driving a gauge having coils in quadrature to generate a resultant magnetic field in accordance with currents applied thereto and having a pointer angularly swept by the field, the apparatus having a memory to store a first data defining ... | 06/09/1992 |
| 5097203 | Method and circuit for producing an input variable for a cross-coil indicating device A method of producing an input variable for a cross-coil indicating instrument from a measurement signal is disclosed in which the frequency of the measurement signal is converted into a frequency-proportional input current for the cross-coil indicating i... | 03/17/1992 |
| 5055775 | Transmission device An apparatus for tranmitting signals that can be broken down into at least one AC voltage component between a rotor and a stator from a sender unit to a receiver unit, with the help of annular coils, the coil windings of which form components of the sende... | 10/08/1991 |
| 5051688 | Crossed coil meter driving device having a plurality of input parameters A meter driving device for indicating angular positions corresponding to input values. The device includes a memory for storing previously given input values, angular directions corresponding to the input values, and coefficients representative of the gra... | 09/24/1991 |
| 4988944 | Cross coil type instrument A cross coil type instrument includes a plurality of coils cross-arranged around a movable permanent magnet, a needle fastened to the movable permanent magnet through a shaft projecting from the movable permanent magnet and penetrating the coils, a reset-... | 01/29/1991 |
| 4924178 | Drive apparatus for a cross coil type meter A drive apparatus for a cross-coil type meter has cross-coils formed of a first and a second coil disposed intersecting at the center thereof. A magnet rotor is disposed in a magnetic field set up by the cross coils, and a measurement is represented in te... | 05/08/1990 |
| 4841238 | Gauge driving system An air-core gauge comprising two coils in quadrature has a driving system with switches on a junction terminal and end terminals of the two coils, and a drive circuit controlling the switches so that each terminal is selectively at either of two signal le... | 06/20/1989 |
| 4829254 | Electric motor with velocity indicating device A fractional horsepower permanent magnet direct-current motor has a velocity indicating device positioned around the commutator, between the brush gear and the armature. The device comprises a conductor in the form of a square wave copper strip which is p... | 05/09/1989 |
| 4827209 | Instrument with crossed-coil type movable magnet An instrument has a crossed-coil-type movable magnet in which a movable magnet rotatable about the shaft of a pointer needle is installed in a crossed coil unit and a measured quantity or the like is operated by supplying electric power to the crossed coi... | 05/02/1989 |
| 4818926 | Tachometric device driven by an electric motor A tachometric device is provided with a D.C. electric motor a shaft of which drives a pair of permanent magnets to rotate. A first permanent magnet controls a speed indicator unit; a second permanent magnet is rotatably mounted within a winding the termin... | 04/04/1989 |
| 4804911 | Electromagnetic power generating type rotation sensor An electromagnetic power generating type rotation sensor has a magnetic pole which is divided into an inner magnetic pole piece and an outer magnetic pole piece (3a, 13a) located in a position close to an outer peripheral part or a side part of a magnetic... | 02/14/1989 |
| 4732034 | Tachometer kit with alternator pick up A vehicle tachometer kit including a pick up coil that is adapted to be mounted on the outside of the vehicle's alternator to sense its rotating field without any disassembly. An induced signal in the coil from alternator field leakage provides the normal... | 03/22/1988 |
| 4676097 | Submersible knotmeters Rotary type knotmeters designed to detect relative motion between an underwater vehicle and the water in which it is submersed at relatively great depths comprise a vaned rotor external unit, an electronic counter/display internal unit, a multiplexing tra... | 06/30/1987 |
| 4673874 | Annular rotor disk for electric meter A disk for an electric meter includes a solid annulus of a conductive material with a center of the annulus filled with a non-conducting material. The non-conducting material is preferably molded in place both to capture the annulus and to secure a disk s... | 06/16/1987 |
| 4658658 | Coil system for inductive measurement of the velocity of movement of a magnetized body A movement detection system for use in measuring movements of a rotating body or shaft which is magnetized along an axis which is angularly displaced from the mechanical axis of rotation thereof. The system has a plurality of inductive coils which are con... | 04/21/1987 |
| 4647853 | Mud turbine tachometer In an MWD measurement system, the speed of rotation of a downhole turbine is measured by the interaction of a triaxial magnetometer in a sensor package and a permanent magnet attached to the turbine shaft. The triaxial magnetometer may be part of an exist... | 03/03/1987 |
| 4644788 | Modular marine instrument A modularized marine instrument sensing device is described wherein a paddlewheel assembly for providing an electromagnetic signal proportional to marine vessel speed is separably mountable on retaining members provided in a sensor housing. The sensor hou... | 02/24/1987 |
| 4644787 | Marine instrument A marine speed sensor mounted in a housing which may also include a temperature sensor and a sonic transducer. The speed sensor includes a paddlewheel for producing an electromagnetic field. The paddlewheel is rotatably mounted adjacent the housing and ex... | 02/24/1987 |
| 4556885 | System for detecting position or speed A system for detecting mechanical movement of a body under detection formed of: a synchro generator having a primary and a secondary windings, one of which is capable of being coupled to the body; an exciting circuit for providing exciting current to the ... | 12/03/1985 |
| 4555938 | Marine instrument A marine speed sensor mounted in a housing which may also include a temperature sensor and a sonic transducer. The speed sensor includes a paddlewheel for producing an electromagnetic field. The paddlewheel is rotatably mounted adjacent the housing and ex... | 12/03/1985 |
| 4502853 | Rotational speed sensor for vane compressors In a vane compressor, a rotational speed sensor for sensing the rotational speed of the rotor comprises a permanent magnet embedded in an end face of the rotor, a pin formed of a ferromagnetic material, rigidly fitted in a pump housing accommodating the r... | 03/05/1985 |
