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Class Information
Number: 324/168
Name: Electricity: measuring and testing > Electrical speed measuring > Including speed-related frequency generator > Including periodic switch
Description: Subject matter in which the means for producing a signal includes an electrical circuit breaker actuated at a frequency representative of the speed being measured.

Sub-classes under this class:

Class Number Class Name Patents
324/169 In ignition system 43
324/171 With extent-of-travel indicator 36

Patents under this class:

Patent Number Title Of Patent Date Issued
8531182 Control system and method for providing position measurement with redundancy for safety checking Sep. 10, 2013
8169214 Angular position sensor May. 1, 2012
7915554 Display unit Mar. 29, 2011
6778938 Fan speed detection in the presence of PWM speed control Aug. 17, 2004
6659895 Motion sensor for use with a bicycle sprocket assembly Dec. 9, 2003
6528987 Method and apparatus for determining fan speed Mar. 4, 2003
6101879 Rotation speed sensor Aug. 15, 2000
5606252 Circuit for mooting broken or chipped teeth of encoder wheels via comparing temporal fluctuations between rising or falling edges and using edge with least fluctuation Feb. 25, 1997
5511435 Apparatus for measuring vehicle running condition Apr. 30, 1996
5424635 Shaft speed signal indicator Jun. 13, 1995
5317258 Device for evaluating periodic signals from inductive pick-ups having a pulse former stage influenced as a function of the pick-up signal amplitude May. 31, 1994
5138639 Pulse position measurement type meter-driving circuit capable of improving measurement accuracy Aug. 11, 1992
5008647 Wireless bicycle wheel monitor system Apr. 16, 1991
4939455 Sensor having two-wire connection to load Jul. 3, 1990
4931966 Method of measuring vehicle speed Jun. 5, 1990
4841238 Gauge driving system Jun. 20, 1989
4787072 Structure of electronic watch Nov. 22, 1988
4769595 Pulse length indicator Sep. 6, 1988
4549163 Slip indicating system for a four-wheel drive vehicle Oct. 22, 1985
4482859 Object displacement sensor and device for measuring the rotation speed and vibration frequency of a rotor Nov. 13, 1984
4470012 Apparatus for generating rate signals Sep. 4, 1984
4409548 Piezoelectric apparatus for generating electrically distinguishable bipolar signals Oct. 11, 1983
4376915 Tachometer Mar. 15, 1983
4352063 Self-calibrating speedometer/odometer Sep. 28, 1982
4266147 Circuit arrangement for forming a speed-proportional output voltage from a speed-proportional pulse sequence May. 5, 1981
4266192 Rotational speed detecting apparatus May. 5, 1981
4264905 Drive belt movement detecting system Apr. 28, 1981
4262641 Combined RPM limiter, and electronic tachometer with shift point indicator Apr. 21, 1981
4246790 Combination speed transducer and speedometer cable Jan. 27, 1981
4197748 Distance-measuring apparatus Apr. 15, 1980
4167734 Shaft speed and hot bearing indicating apparatus Sep. 11, 1979
4156190 Electronic bicycle odometer and speedometer May. 22, 1979
4024473 Stroboscopic device May. 17, 1977
3936754 Device for detecting the opening of throttle valve of diesel engine for vehicle Feb. 3, 1976

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