US PATENT SUBCLASS 73 / 204.11
.~ Thermal type

Current as of: June, 1999
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73 /   HD   MEASURING AND TESTING

861  DF  VOLUME OR RATE OF FLOW {23}
204.11.~ Thermal type {9}
204.12  DF  .~.~> With conduit extending between heat sinks
204.13  DF  .~.~> With auxiliary fluid contacting or in heat exchange relation with flow path (e.g., thermodilution)
204.14  DF  .~.~> Including digital or pulse measuring circuitry
204.15  DF  .~.~> Including detail of feedback or rebalancing circuitry {1}
204.17  DF  .~.~> With distinct heating circuitry for a self-heated sensor
204.18  DF  .~.~> Including response characteristic or condition compensation {1}
204.21  DF  .~.~> With fluid flow deflector or restrictor (e.g., baffle, constriction)
204.22  DF  .~.~> With sensor housing
204.23  DF  .~.~> Having particular electrical heating, cooling, or thermal sensing element {2}

DEFINITION

Classification: 73/204.11

Thermal type:

(under subclass 861) Subject matter in which the rate of flow of a fluid is determined by a sensed thermal effect caused by such flow.

(1) Note. Such measurement often includes determination of the cooling effect upon a heated element.

SEE OR SEARCH THIS CLASS, SUBCLASS:

118.2, for measurement intake air flow in an internal combustion engine.

152.33, for a flowmeter for determining a characteristic of a borehole, a well casing, or a drill rigging by measuring a rate of fluid flow responsive to a thermal property of a fluid.

198, for fluid flow measuring combined with diverse subject matter.

202.5, for thermal sensing of flow including an auxiliary testing flow path. 861.95, for flow measuring by use of a thermal tracer or tag.

SEE OR SEARCH CLASS

374, Thermal Measuring and Testing, appropriate subclasses for measuring and testing of a thermal effect, per se; particularly

29+, for heat flow measurement, and subclasses 43+ for heat flow coefficient measurement.