US PATENT SUBCLASS 60 / 621
.~.~ Movable wall portions are rigidly interconnected

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

597  DF  FLUID MOTOR MEANS DRIVEN BY WASTE HEAT OR BY EXHAUST ENERGY FROM INTERNAL COMBUSTION ENGINE {5}
620  DF  .~ Fluid motor means is expansible chamber type with movable parts of motor and engine being interconnected {3}
621.~.~ Movable wall portions are rigidly interconnected

DEFINITION

Classification: 60/621

(under subclass 620) Apparatus, in which the mechanically interconnected working members comprise rigidly interconnected pistons or diaphragms.