Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 8035370 | Systems and methods to stir an electromagnetic (EM) field Systems and methods to stir an electromagnetic (EM) field of an EM reverberation chamber are disclosed. A particular system includes an EM reverberation chamber. The system also includes a transmit antenna and a receive antenna operable to generate an EM field withi... | 10/11/2011 |
| 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 |
| 7012535 | Battery operated warning sensor An alarm device for signaling when an object reaches a specified condition. The alarm device includes a sensor for detecting the condition of the object. The device further includes a switch element which is closed when the sensor indicates the specified condition. ... | 03/14/2006 |
| 6993987 | Meter unit having indication part and control part A meter unit for indicating a physical quantity includes an indication part and a control part. The indication part memorizes a first indication deviation data, which provides a deviation between a detected value detected by a physical quantity sensor and a raw valu... | 02/07/2006 |
| 6531864 | High torque electromagnetic devices A high torque electromagnetic device such as a moving magnet galvanometer includes a composite electromagnetic coil. The composite electromagnetic coil includes two pancake-shaped coil parts made using a rectangular conductor having a width and a thicknes... | 03/11/2003 |
| 6400132 | Cross-coil type indicating instrument A cross-coil type indicating instrument includes a dial plate, a bobbin disposed behind the dial plate, a pair of coils wound around the bobbin to cross each other, a plurality of terminals, a circuit board supported at a rear portion of the dial plate, a... | 06/04/2002 |
| 6384592 | Apparatus for minimizing angular rotor position errors in an air core gauge An apparatus for minimizing angular rotor position errors in an air core gauge includes an air core gauge (105) having a magnetic rotor (108) and at least three coils (102, 104 and 106) wound around the rotor (108). A probe signal is applied to the first ... | 05/07/2002 |
| 6326781 | 360 degree shaft angle sensing and remote indicating system using a two-axis magnetoresistive microcircuit A system for sensing and indicating the angular position of a shaft through 360 degrees of rotation using a two-axis magnetoresistive microcircuit, a two pole magnet which rotates with the input shaft, a two channel operational amplifier, and an electrome... | 12/04/2001 |
| 6323637 | Miniature crossed coil gauge having an active flux ring A miniature crossed coil gauge is provided having an oriented rare earth magnet fixedly mounted on a rotary shaft for supplying a magnetic flux directed transverse to the shaft axis. The gauge housing provided by an upper and lower bobbin surrounds the ma... | 11/27/2001 |
| 6294907 | Cross-coil type indicating instrument A cross-coil type indicating instrument includes a bobbin having an upper center cylinder and a lower center cylinder, a cross-coil unit disposed around the bobbin, a shaft coaxially and rotatably supported by the upper and lower cylinder, a permanent mag... | 09/25/2001 |
| 6184693 | Electromagnetic noise measurement apparatus A first substrate having a first electromagnetic noise sensor on its surface perpendicularly intersects with a second substrate having a second electromagnetic noise sensor on its surface, making up an integral structure. A first induced voltage value out... | 02/06/2001 |
| 6046583 | Miniature crossed coil gauge having an active flux ring A miniature crossed coil gauge is provided having an oriented rare earth magnet fixedly mounted on a rotary shaft for supplying a magnetic flux directed transverse to the shaft axis. The gauge housing provided by an upper and lower bobbin surrounds the ma... | 04/04/2000 |
| 6026355 | Solid state watt-hour meter using GMR sensor A power consumption meter is disclosed for measuring the power consumed by a load on a power conductor, wherein the electronics of the power consumption meter are isolated from lightning and power transients. The meter has a first GMR sensor that is dispo... | 02/15/2000 |
| 5994893 | Driving apparatus for stepping motor type instrument A stepping motor type instrument 6 has driving circuits 3, 4 for driving a stepping motor based on a digital signal corresponding to a measurement quantity and a needle 9 fixed to a driving shaft end of this stepping motor indicates the measurement quanti... | 11/30/1999 |
| 5986445 | Cross-coil type indicating instrument having a zero-return magnetic projection member A cross-coil type indicating instrument includes a bobbin, a cross-coil unit disposed around the bobbin, a shaft, a permanent magnet rotor disposed inside the bobbin, a dial having a zero position, a pointer carried by the shaft, and a magnetic shield cas... | 11/16/1999 |
| 5698974 | Robust gauge driving circuit with pulse modulated input An input circuit for an automotive gauge driver receives a pulse width modulated or pulse frequency signal having a duty cycle representing a parameter to be displayed. A switching transistor controls an RC filter to develop an analog voltage proportional... | 12/16/1997 |
| 5686832 | Miniature crossed coil gauge having an active flux ring A miniature crossed coil gauge is provided having an oriented rare earth magnet fixedly mounted on a rotary shaft for supplying a magnetic flux directed transverse to the shaft axis. The gauge housing provided by an upper and lower bobbin surrounds the ma... | 11/11/1997 |
| 5610513 | Cross coil meter with correction for resistance variations A memory stores correction coefficients for correcting variations of resistance values of coils Ls and Lc depending upon a temperature. A temperature or a resistance value of a cross coil meter is detected, and an output of a microco... | 03/11/1997 |
| 5561374 | Method for displaying a vehicle speed measurement with improved display response characteristics A vehicle speed measurement system (8) and method for driving a vehicle speed display responsive to a vehicle speed signal (300-334). A vehicle speed signal having a period corresponding to distance traveled by a vehicle is counted each first predetermine... | 10/01/1996 |
| 5514960 | Electromagnetic drive device having a plurality of sinusoidal coils An electromagnetic drive means for providing motion. An application is as an indicator device for registering the magnitude of an input supplied to a computer by an external sensor is described. The electromagnetic drive means includes a first stationary ... | 05/07/1996 |
| 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 |
| 5365200 | CMOS gauge driver An integrated circuit apparatus comprises a first stage amplifier and a second stage amplifier. The first stage amplifier is characterized by a cross-coupled integrated layout providing a rail-to-rail swing and a linear gain, A, substantially defined as A... | 11/15/1994 |
| 5359284 | Air core gauge magnetic hysteresis compensation An air core gauge apparatus includes a sensor for determining a measure of a parameter, a microprocessor controller receiving the measure of parameter from the sensor and operative to (a) determine an ideal gauge position responsive to the parameter measu... | 10/25/1994 |
| 5347213 | Air core gauge method and apparatus with reduced power dissipation An air core gauge method and apparatus are disclosed. The apparatus receives an input signal and comprises a gauge device and driver circuit for driving the gauge device. A detection circuit detects transitions in the input signal and provides a control o... | 09/13/1994 |
| 5311118 | Ripple elimination in a frequency-to-voltage converter for a cross-coil meter A frequency-to-voltage converter comprises a pulse generator, an integrator, an inverting amplifier, and a superimposing circuit. The pulse generator generates a pulse signal having a predetermined width. The integrator integrates and outputs the pulse si... | 05/10/1994 |
| 5291126 | Pulse width modulation driving circuit for a cross coil meter A meter drive apparatus using a counter for counting reference clocks and a comparator for comparing the output value of the counter and the data indicating a directive target of a meter. The output of the comparator is supplied to steering logic where th... | 03/01/1994 |
| 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 |
| 5093615 | Movement for an instrument having an electromagnetic control arrangement A movement for instrument is of thin construction. A rotatably supported shaft extends through a thin magnet and supports the magnet on it. The magnet radiates a magnetic field that varies in magnetic field strength in accordance with a sine function alon... | 03/03/1992 |
| 5063344 | Mode selectable interface circuit for an air core gage controller A single integrated circuit operable in either a single chip mode or a host dependent mode. The integrated circuit comprises mode select circuitry for selecting the single chip mode or the host dependent mode, data acquisition circuitry for acquiring sign... | 11/05/1991 |
| 5017862 | Air-core meter having improved bobbin design An air-core meter having a two-piece bobbin enclosing and surrounding a moveable magnet within a sealed cavity containing a damping fluid. The magnet is rotated about the axis of a supporting shaft by a plurality of orthogonally related windings disposed ... | 05/21/1991 |
| 5004976 | Wye winding radial air-core gauge system A wye-type air-core gauge system provides magnitude indications of measurands in response to PWM signals generated by a control unit that receives electrical signals from a sensor that represents magnitude variations of the measurand. The size of the stat... | 04/02/1991 |
| 4928060 | Driving circuit of a crossed-coil type instrument using digital data pulse production A driving circuit for driving a crossed-coil type instrument used for reading a physical quantity in which a pair of windings surrounding a movable magnet carrying a pointer needle thereon are disposed to cross each other with a predetermined mechanical a... | 05/22/1990 |
| 4879510 | Electrical indicator having an optical position encoder An indicator includes an indicating member driving unit, an encoder plate, a rotational position detecting unit, and an indication position control unit. The indicating member driving unit rotates an indicating member mounted on a rotor shaft in accordanc... | 11/07/1989 |
| 4845424 | Rotary displacement motor A vane-type galvanometer employs a stator having a unibody type structure. Narrow bridge regions of the stator are magnetically saturated to produce regions of high magnetic reluctance and salient magnetic poles in the stator. A pre-wound bobbin is mounte... | 07/04/1989 |
| 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 |
| 4715043 | Cross-coil type indicating instrument A cross-coil type indicating instrument has a permanent magnet arranged in a plurality of coils that are wound mutually crossed and indicates the value corresponding to a physical quantity detected by a sensor through turning the permanent magnet by suppl... | 12/22/1987 |
| 4205520 | Key-operated cover reset mechanism for time switch clock of a time switch and watthour meter or the like A watt-hour meter including a time switch and clock dial is provided with a key-operated rotary reset actuator mounted on the cover, in which a key is utilized to allow the rotary reset actuator to be extended into the meter behind the cover in contact wi... | 06/03/1980 |
