US PATENT SUBCLASS 405 / 80
.~ Flow control

Current as of: June, 1999
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405 /   HD   HYDRAULIC AND EARTH ENGINEERING

52  DF  FLUID CONTROL, TREATMENT, OR CONTAINMENT {7}
80.~ Flow control {7}
81  DF  .~.~> Fishway {2}
84  DF  .~.~> Navigable canal {1}
87  DF  .~.~> Water gate or adjustable weir {7}
107  DF  .~.~> Artificial water barrier (e.g., dam, levee, etc.) {7}
118  DF  .~.~> Open channel {1}
124  DF  .~.~> Culvert {2}
127  DF  .~.~> Intake

DEFINITION

Classification: 405/80

Flow control:

(under subclass 52) Method or apparatus for conducting a fluid through a predetermined path or for regulating or modifying the fluid's movement through such a path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

15+, for subject matter concerned with controlling or altering a natural current to preserve a bank, shore, or bed.