US PATENT SUBCLASS 198 / 662
.~.~ Plural helical surface formations

Current as of: June, 1999
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198 /   HD   CONVEYORS: POWER-DRIVEN

618  DF  CONVEYOR SECTION {26}
657  DF  .~ Screw {11}
662.~.~ Plural helical surface formations {4}
663  DF  .~.~.~> Separate, parallel formations supporting same load
664  DF  .~.~.~> Transversing less than 360 degrees {1}
666  DF  .~.~.~> Coupled end-to-end {2}
669  DF  .~.~.~> Of opposite hand

DEFINITION

Classification: 198/662

(under subclass 657) Apparatus wherein there are a plurality of helical surface formations.