US PATENT SUBCLASS 34 / 147
.~ Spiral treated material path type

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34 /   HD   DRYING AND GAS OR VAPOR CONTACT WITH SOLIDS

523  DF  APPARATUS {40}
147.~ Spiral treated material path type

DEFINITION

Classification: 34/147

(under the class definition) Apparatus in which the material undergoing treatment travels in a generally spiral or helical path.

(1) Note. For the most part the material moves by gravity, sliding down a spiral guide or being carried on supports which move along a spiral path.

SEE OR SEARCH THIS CLASS, SUBCLASS:

165, and indented subclasses, for shafts for material moving downwardly by gravity in various irregular paths.

SEE OR SEARCH CLASS

193, Conveyors, Chutes, Skids, Guides, and Ways,

12, and 13. 198, Conveyors: Power-Driven,

657+, and 778 and indented subclasses.