This is my U.S. Patent list index. For patent application information or to
view a complete patent from the USPTO site, click on the patent number.
Note: Last Up Date - ---- 1-4-05
All patents will be presented with
application engineering information and
data as writing time permits.

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TRD Racing Patent Plaque
4,959,629: A High Torque Rotary Solenoid
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5115194: A Hall Effect Speed and Position Sensor
5,264,792:  A Hall Effect Flux Return Pole Piece Position Sensor
5,321,355:  A Hall Effect Position Sensor Pole Piece Design
5,444,369:  A Hall Effect Rotational Angle Position Sensor
5,448,217:  An Ignition Coil with Spark Duration Control
6,137,288:  A Hall Effect Rotational Angle Sensor with Zero Hysteresis
6,356,076:  A Magnetoresistive Gear Tooth Sensor
6,417,664:  A Hall Effect Rotational Angle Sensor with an Interrupted Pole Piece
6,459,261:  A Magnetoresistive Gear Tooth Position Sensor Electronic Circuit
6,472,865:  A Dual Hall Effect Rotational Angle Position Sensor
6,509,734:  A Hall Effect Electronic Control Circuit for a Rotational Angle Position Sensor
Foreign Patents
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6,586,929: A linear Travel Position Sensor Magnetic
6,653,830: A Magnetoresistive Linear Position Sensor with Shaped Pole
Click here for information
on building capacitive type
sensors using expired patent
Click here to go to
the geartooth sensor
signal conditioning
circuit page
6,717,399: A Gear Tooth MR Electronic Sensor Circuit
6,798,195: A linear Position Sensor
Other Rotary Angle Sensor  Patents
That Reference
Patents 5,444,369 and 6,137,288
How-to- Build Instructions: Click Here
Building a Hall Effect Gear Tooth Sensor
or a
        Ferrous Object Position Sensor