US PATENT SUBCLASS 337 / 120
.~.~ With external heating means (external from fluid; may be the container)

Current as of: June, 1999
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337 /   HD   ELECTRICITY: ELECTROTHERMALLY OR THERMALLY ACTUATED SWITCHES

14  DF  ELECTROTHERMALLY ACTUATED SWITCHES {9}
114  DF  .~ Expansible or vaporizable fluid-actuated (e.g., mercury vapor) {5}
120.~.~ With external heating means (external from fluid; may be the container)

DEFINITION

Classification: 337/120

(under subclass 114) Subject matter including heat concentrating or generating means, such as heating coils or high resistance elements, responsive to the current in a circuit to be controlled, and whereby the change in condition of the contact controlling fluid is brought about.

SEE OR SEARCH THIS CLASS, SUBCLASS:

324, for similar devices utilizing thermally responsive fluid actuating means.

SEE OR SEARCH CLASS

60, Power Plants,

516+, for expansion and contraction power plants with

expansible fluid heated by external means. 165, Heat Exchange,

200+, especially subclasses 223+ and 257, for anticipating type thermostatic controls with auxiliary heater.

200, Electricity: Circuit Makers and Breakers,

81+, for fluid pressure switch which may have auxiliary heating means.

219, Electric Heating,

511, for thermally responsive expansible fluid actuated switches for electric heaters and having auxiliary heating means.

236, Automatic Temperature and Humidity Regulation,

86, for thermostatic expanding operated motor type temperature regulators which may have auxiliary heaters.

361, Electricity: Electrical Systems and Devices,

161+, for thermoelectric switch in the control circuit of a relay or electromagnet and having external heater means.