US PATENT SUBCLASS 37 / 317
.~ Suction

Current as of: June, 1999
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37 /   HD   EXCAVATING

307  DF  BENEATH A BODY OF WATER (E.G., DREDGER) {11}
317.~ Suction {8}
318  DF  .~.~> Having intake screen {1}
320  DF  .~.~> With pumping chamber
321  DF  .~.~> With means to introduce lift agent directly into suction pipe {1}
323  DF  .~.~> With fluid jet digger adjacent suction inlet
324  DF  .~.~> Including driven digger adjacent suction inlet (e.g., cutterhead dredger) {3}
333  DF  .~.~> Draghead dredger (e.g., dustpan dredger)
334  DF  .~.~> With pipe suspension or support (e.g., ladder structure)
335  DF  .~.~> Pipe or nozzle structure {1}

DEFINITION

Classification: 37/317

Suction:

(under subclass 307) Apparatus wherein the material is removed from the bottom of a body of water by a flexible,

noncollapsible pipe, provided at its lower end with a weighted nozzle having means (e.g., suction pump) for creating a pressure less than the surrounding environment for entrainment of the material into the pipe.

SEE OR SEARCH CLASS

406, Conveyors: Fluid Current,

151+, for subject matter wherein the load is drawn into the conveyor by a vacuum at the inlet by forcing or withdrawing conveying fluid into or from the fluid flow path at a point subsequent to the inlet.

417, Pumps,

65+, for subject matter wherein one fluid is pumped by contact or entrainment with another.