US PATENT SUBCLASS 60 / 516
MOTOR OPERATED BY EXPANSION AND/OR CONTRACTION OF A UNIT OF MASS OF MOTIVATING MEDIUM

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

516MOTOR 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}
527  DF  .~> Mass is a solid {2}
530  DF  .~> Mass is a liquid {1}

DEFINITION

Classification: 60/516

(under the class definition) Apparatus having means which may heat, cool or otherwise cause a defined unit of matter as a working medium in the gaseous liquid, or solid state to expand and contract cyclically to do useful work.

(1) Note. The confined matter may change state during expansion or contraction thereof.

(2) Note. The distinction between the plants in this subclass and the plants in subclasses 508+, where a motive fluid is introduced into an expansible chamber and heated or cooled therein to expand or contract said chamber, is that in the latter a definable mass is not isolated as a motive fluid which is subject to heating and cooling and thus expansion and contraction for more than one cycle.

SEE OR SEARCH CLASS

62, Refrigeration,

6, for "Stirling" cycle refrigeration producers, and subclasses 498+ for compressor-condenser-evaporator circuits for refrigerator producers.

236, Automatic Temperature and Humidity Regulation, 68, for temperature regulators which include a thermal expansion and contraction device whose operation is effected by a heater set into operation by a heat responsive initiator.

251, Valves and Valve Actuation,

11, for heat motor actuated valves.

374, Thermal Measuring and Testing,

100+, for thermometers, especially subclasses 187+ where an ambient temperature is measured using a solid or fluid having known properties of expansion or contraction in response to given changes in temperature.