US PATENT SUBCLASS 165 / 184
.~.~.~ Helical

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

177  DF  TUBULAR STRUCTURE {4}
181  DF  .~ With discrete heat transfer means {2}
183  DF  .~.~ Longitudinal extending {1}
184.~.~.~ Helical

DEFINITION

Classification: 165/184

(under subclass 183) Apparatus in which the distinct heat conducting structure forms a helix about the tubular

structure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

156, for coaxial enclosures with means forming a helical passage in the annular outer enclosure.