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Class Information
Number: 337/120
Name: Electricity: electrothermally or thermally actuated switches > Electrothermally actuated switches > Expansible or vaporizable fluid-actuated (e.g., mercury vapor) > With external heating means (external from fluid; may be the container)
Description: 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.

Patents under this class:

Patent Number Title Of Patent Date Issued
5708553 Automatic switching-off structure for protecting electronic device from burning Jan. 13, 1998
4739297 Electric relay with a thermistor associated with a casing enclosing a thermally expandable mass and a rod actuating a rocker lever Apr. 19, 1988
4379220 Method of heating liquid Apr. 5, 1983
4276466 Heater with distributed heating element Jun. 30, 1981
4254312 Temperature compensated fill valve/pressure switch Mar. 3, 1981
4021643 Immersion heater for aquariums May. 3, 1977

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