US PATENT SUBCLASS 137 / 829
.~.~ By movable element

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}
829.~.~ By movable element {3}
830  DF  .~.~.~> Operating at timed intervals (e.g., to produce pulses)
831  DF  .~.~.~> Electrically-actuated element (e.g., electro-mechanical transducer)
832  DF  .~.~.~> Means (e.g., valve) in control input

DEFINITION

Classification: 137/829

(under subclass 825) Device wherein said means is a member that can move relative to the passages provided for flow of fluid.

(1) Note. This and the indented subclasses are those which provide for the exceptions to the "no-moving-parts" rule referred to in (4) Note to the definition of subclass 803.