US PATENT SUBCLASS 338 / 25
.~ Ambient temperature

Current as of: June, 1999
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338 /   HD   ELECTRICAL RESISTORS

13  DF  RESISTANCE VALUE RESPONSIVE TO A CONDITION {10}
25.~ Ambient temperature {4}
26  DF  .~.~> Cable or tape type (e.g., fire-detecting cable)
27  DF  .~.~> Liquid contact or element
28  DF  .~.~> Probe type {2}
31  DF  .~.~> Mechanically adjustable or variable

DEFINITION

Classification: 338/25

(under subclass 13) Subject matter wherein the resistance element includes material which effects a significant change, such as sharp, rapid, or pronounced, in the resistance value of the element with a change in the surrounding temperature, or together with structure which facilitates this change in resistance value with the surrounding temperature; or including a mechanically adjustable or variable resistor together with structure whose shape, configuration or any other dimension changes with a change in surrounding temperature, the structure being linked with the adjustable or variable resistor to change in resistance value with the change in shape, configuration or other dimension occurring in the temperature sensing structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

7+, for resistors with compensation for a change in resistance value due to temperature change.

20+, for resistors whose resistance value changes in response to a current or voltage, which may involve a change in the ambient temperature of the resistor.

51, for resistors with heat dissipating projections.

53+, for resistors with cooling gas or liquid circulation.

59, for resistors with heat storing. SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation, appropriate subclasses, for automatic temperature controls, especially the subclasses found under THERMOSTATIC.

313, Electric Lamp and Discharge Devices,

14, for temperature modified pyroelectric type devices.

323, Electricity: Power Supply or Regulation Systems,

294, and subclass 364+ for thermally responsive impedance systems.

340, Communications: Electrical,

584+, and 577+ for electrical systems generally responsive to temperature and flame, respectively.

374, Thermal Measuring and Testing,

183+, for current modifying type thermometers.