US PATENT SUBCLASS 165 / 91
.~.~.~ With drum surface scraper

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

86  DF  MOVABLE HEATING OR COOLING SURFACE {4}
89  DF  .~ Rotary drum {1}
90  DF  .~.~ With means applying fluids for exchange through drum wall {1}
91.~.~.~ With drum surface scraper

DEFINITION

Classification: 165/91

(under subclass 90) Apparatus with a blade device extending along a surface of the tank cylinder and traversed by the surface during its movement.