US PATENT SUBCLASS 60 / 521
.~.~ Having means to increase or diminish quantity of motivating mass

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

516  DF  MOTOR OPERATED BY EXPANSION AND/OR CONTRACTION OF A UNIT OF MASS OF MOTIVATING MEDIUM {3}
517  DF  .~ Unit of mass is a gas which is heated or cooled in one of a plurality of constantly communicating expansible chambers and freely transferable therebetween {9}
521.~.~ Having means to increase or diminish quantity of motivating mass

DEFINITION

Classification: 60/521

(under subclass 516) Apparatus having a particular means whereby gas may be added to or withdrawn from the unit of gas employed as the working medium.