US PATENT SUBCLASS 60 / 641.1
UTILIZING NATURAL HEAT

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

641.1UTILIZING NATURAL HEAT {3}
641.2  DF  .~> Geothermal {3}
641.6  DF  .~> With natural temperature differential {1}
641.8  DF  .~> Solar {4}

DEFINITION

Classification: 60/641.1

UTILIZING NATURAL HEAT:

(under the class definition) Subject matter operating by means of heat evolved from natural sources, such as from the sun, air, water, earth, etc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

398, for a power system including a pressure fluid source and motor utilizing natural energy other than heat.

495, for a motor having a buoyant working member, a tide or wave motor, for example.

SEE OR SEARCH CLASS

126, Stoves and Furnaces,

561+, 569+, and 714 for a solar heater, per se. 136, Batteries: Thermoelectric and Photoelectric,

206, for a solar energy type of electrical generator.

165, Heat Exchange,

45, for a heat exchanger related to the earth or sun.