US PATENT SUBCLASS 236 / 68 D
.~.~.~ Thermo-controlled pilot burner operates a heat motor to actuate main fuel valve

Current as of: June, 1999
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236 /   HD   AUTOMATIC TEMPERATURE AND HUMIDITY REGULATION

67  DF  MOTORS {7}
*  DD  .~ Relay {2}
68 R  DF  .~.~ Auxiliary heater {4}
68 D.~.~.~ Thermo-controlled pilot burner operates a heat motor to actuate main fuel valve

Unofficial Alpha Subclasses: R A B C D

DEFINITION

Classification: 236/68

(under subclass 67) Devices in which an expanding element is used to operate the controlling means, the expanding element being heated (or cooled) by a heater set into operation by means of a separate element responsive to the temperature to be regulated.

SEE OR SEARCH CLASS

60, Power Plants,

516+, for the expanding element and heater alone or where the heater is not set into operation by a heat responsive element.

251, Valves and Valve Actuation,

11, for heat motor operated valves in general.