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Class Information
Number: 324/167
Name: Electricity: measuring and testing > Electrical speed measuring > Including speed-related frequency generator > Including rotating magnetic field actuated indicator
Description: Subject matter including electro-magnetic, indicator driving means energized by the speed signal to produce a rotating magnetic field whose rotation is synchronized with the frequency of the speed signal.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8618792 Rotation angle detection device, and rotation angle detection method Dec. 31, 2013
8531182 Control system and method for providing position measurement with redundancy for safety checking Sep. 10, 2013
8466672 Method of processing encoder signals Jun. 18, 2013
8278914 Rotation angle detector Oct. 2, 2012
8169214 Angular position sensor May. 1, 2012
8164324 Rotation sensor Apr. 24, 2012
7878521 Bicycle frame with device cavity Feb. 1, 2011
7812713 Device for measuring speed, particularly for cycles Oct. 12, 2010
7583090 Electromagnetic apparatus for measuring angular position Sep. 1, 2009
7253610 Self-powered bicycle signal output device and display apparatus using same Aug. 7, 2007
7230418 Flutter reduction apparatus and method Jun. 12, 2007
7173409 Image forming device Feb. 6, 2007
7096136 Method for detecting rotational speed Aug. 22, 2006
6859030 Method for determining the rotational position of the drive shaft of a direct current motor Feb. 22, 2005
6456063 Self compensating control circuit for digital magnetic sensors Sep. 24, 2002
6393912 Electromagnetic method of the angular displacement monitoring May. 28, 2002
6018240 Cross-coil measuring meter driving device having a period range judging means and an after-change supply prevention means Jan. 25, 2000
5825338 Instrument display method and system for passenger vehicle Oct. 20, 1998
5757676 Method for measuring speed May. 26, 1998
5633062 Method of manufacturing rotation sensor and structure of rotation sensor May. 27, 1997
5497078 Method and system for driving an air core gauge with improved pointer resolution Mar. 5, 1996
5489842 Method and apparatus for determining the rotational position of a magnetic rotor relative to current carrying coils utilizing magnetic coupling between coils Feb. 6, 1996
5448163 Meter drive including a timer for generating update cycles at a frequency larger than the input clock pulses and digital filtering Sep. 5, 1995
5369360 Recessed paddle wheel speed measuring device for personal watercraft Nov. 29, 1994
5315536 Meter driving system May. 24, 1994
5309087 Air core gauge, multi-frequency pulse width modulator system therefor May. 3, 1994
5121347 Apparatus for manipulating triangular wave signals used to drive a gauge having a pair of coils arranged in quadrature Jun. 9, 1992
5097203 Method and circuit for producing an input variable for a cross-coil indicating device Mar. 17, 1992
5055775 Transmission device Oct. 8, 1991
5051688 Crossed coil meter driving device having a plurality of input parameters Sep. 24, 1991
4988944 Cross coil type instrument Jan. 29, 1991
4924178 Drive apparatus for a cross coil type meter May. 8, 1990
4841238 Gauge driving system Jun. 20, 1989
4829254 Electric motor with velocity indicating device May. 9, 1989
4827209 Instrument with crossed-coil type movable magnet May. 2, 1989
4818926 Tachometric device driven by an electric motor Apr. 4, 1989
4804911 Electromagnetic power generating type rotation sensor Feb. 14, 1989
4732034 Tachometer kit with alternator pick up Mar. 22, 1988
4676097 Submersible knotmeters Jun. 30, 1987
4673874 Annular rotor disk for electric meter Jun. 16, 1987
4658658 Coil system for inductive measurement of the velocity of movement of a magnetized body Apr. 21, 1987
4647853 Mud turbine tachometer Mar. 3, 1987
4644788 Modular marine instrument Feb. 24, 1987
4644787 Marine instrument Feb. 24, 1987
4556885 System for detecting position or speed Dec. 3, 1985
4555938 Marine instrument Dec. 3, 1985
4502853 Rotational speed sensor for vane compressors Mar. 5, 1985
4493988 Odometer using an electric motor disposed within annular figure wheels Jan. 15, 1985
4475105 System for detecting mechanical movement Oct. 2, 1984
4410853 Frequency detector Oct. 18, 1983

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