US PATENT SUBCLASS 406 / 53
.~.~ Screw

Current as of: June, 1999
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406 /   HD   CONVEYORS: FLUID CURRENT

51  DF  WITH DIVERSE POWER-DRIVEN CONVEYOR {4}
52  DF  .~ Rotary {5}
53.~.~ Screw {3}
54  DF  .~.~.~> With material recirculating screw
55  DF  .~.~.~> Including means to fluidize material
56  DF  .~.~.~> Feeding to fluid conveyor inlet {3}

DEFINITION

Classification: 406/53

Screw:

(under subclass 52) Subject matter wherein the load moving surfaces is in the shape of a helix.

SEE OR SEARCH CLASS

198, Conveyors: Power-Driven,

467.1, 550.1, 550.6 for screw conveyors, per se.