US PATENT SUBCLASS 137 / 827
.~.~ By non-fluid energy field affecting input (e.g., transducer)

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}
825  DF  .~ Means to regulate or vary operation of device {3}
827.~.~ By non-fluid energy field affecting input (e.g., transducer) {1}
828  DF  .~.~.~> Acoustical or thermal energy

DEFINITION

Classification: 137/827

(under subclass 825) Device wherein said means causes the generation of force other than the force of a stream of fluid, said force causing a change in the output stream.

(1) Note. In this subclass (827) the power or energy is often that of electricity. See (1) Note to the definition of subclass 831 for a distinction between the subclasses involved.

(2) Note. The described device, which converts electrical energy or signals into fluid energy or signals, is often termed a "transducer".