US PATENT SUBCLASS 137 / 591
.~.~ Inverted "U" passage


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

561 R  DF  SYSTEMS {32}
590  DF  .~ Tank with internally extending flow guide, pipe or conduit {3}
591.~.~ Inverted "U" passage


DEFINITION

Classification: 137/591

(under subclass 590) Systems in which the internally extending pipe comprises a conduit of inverted U-shape.

(1) Note. In order that the conduit be considered U-shaped, the shorter leg must be of substantial length.

SEE OR SEARCH THIS CLASS, SUBCLASS:

123+, for siphon type fluid handling devices.

216+, for antisiphon devices wherein an inverted U-shaped pipe is provided with a vent at the highest point to prevent back flow, the normal use of the device not being as a siphon.

440, for float arm operated valve associated with a U-shaped inlet, usually mounted in a tank.