US PATENT SUBCLASS 60 / 372
.~.~.~ Pneumatic counter-balance of gravity load on motor (e.g., deep well pump rod, etc.)

Current as of: June, 1999
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60 /   HD   POWER PLANTS

325  DF  PRESSURE FLUID SOURCE AND MOTOR {47}
369  DF  .~ Cyclically operable reciprocating or oscillating motor or output stroke device {11}
371  DF  .~.~ Having means to store and release energy usable to energize motor work output means {1}
372.~.~.~ Pneumatic counter-balance of gravity load on motor (e.g., deep well pump rod, etc.)

DEFINITION

Classification: 60/372

(under subclass 371) Apparatus wherein the energy resulting from the gravitational force on the load is stored during a part of the cycle of operation of the motor means for release to aid in the activation of the working member during another part of the cycle of operation of the motor.