US PATENT SUBCLASS 137 / 804
.~ Responsive to condition external of system

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

803  DF  FLOW AFFECTED BY FLUID CONTACT, ENERGY FIELD OR COANDA EFFECT (E.G., PURE FLUID DEVICE OR SYSTEM) {11}
804.~ Responsive to condition external of system {1}
805  DF  .~.~> And causing change or correction of sensed condition

DEFINITION

Classification: 137/804

(under subclass 803) Device or system which senses or detects or which is provided with additional means to sense or detect, a characteristic or state of the environment outside of said device or system, and which generates a signal or impulse as a result of such sensing or detecting.

(1) Note. This and indented subclasses provide a locus for patents wherein a condition of fluid is sensed, such as, for example, the level of liquid in a tank, or the speed of fluid flow, or the temperature of fluid (as reflected in the frequency of pulses therein). In the patents of this subclass (804) a signal indicating the condition is sent. In the patents of the indented subclass (805) the signal activates mechanism to change or correct the sensed condition. Thus, it is apparent that this subclass (804) and the indented subclass (805) provide for a fluid-handling system classifiable in Class 137 which system includes a subcombination (e.g., a valve, tank, etc.) that, per se, is not proper for original classification in subclasses 803+. However, the patent to the system is classifiable herein due to the inclusion of a fluidic device as a subcombination of a fluid-handling system.

SEE OR SEARCH CLASS

374, Thermal Measuring and Testing,

118, for a temperature responsive fluidic oscillator combined with an indicating device.