US PATENT SUBCLASS 701 / 81
.~.~.~.~ Four wheel drive, electric, or heavy vehicles

Current as of: June, 1999
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701 /   HD   DATA PROCESSING: VEHICLES, NAVIGATION, AND RELATIVE LOCATION

1  DF  VEHICLE CONTROL, GUIDANCE, OPERATION, OR INDICATION {19}
70  DF  .~ Indication or control of braking, acceleration, or deceleration {3}
71  DF  .~.~ Antiskid, antilock, or brake slip control {6}
78  DF  .~.~.~ Control of brake pressure {3}
81.~.~.~.~ Four wheel drive, electric, or heavy vehicles

DEFINITION

Classification: 701/81

Four wheel drive, electric, or heavy vehicles:

(under subclass 78) Brake pressure control wherein the control of the brake pressure is specifically designed for vehicles characterized as one of either (a) having driving means in direct connection with four wheels of the vehicle, (b) having an electrical prime mover, or (c) vehicles catagorize as large machinery (i.e. heavy duty).