US PATENT SUBCLASS 165 / 87
.~ Hollow screw type impeller

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

86  DF  MOVABLE HEATING OR COOLING SURFACE {4}
87.~ Hollow screw type impeller

DEFINITION

Classification: 165/87

(under subclass 86) Apparatus wherein the movable surface means is a part of a hollow rotating device and said surface is in the plane of a helix about the axis of rotation of the device.

SEE OR SEARCH CLASS

416, Fluid Reaction Surfaces (i.e., Impellers)

96+, for a hollow rotary impeller with a heat exchange medium therein.