US PATENT SUBCLASS 165 / 177
TUBULAR STRUCTURE

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

177TUBULAR STRUCTURE {4}
178  DF  .~> With support or flow connector
179  DF  .~> Projecting internal and external heat transfer means
180  DF  .~> Diverse materials
181  DF  .~> With discrete heat transfer means {2}

DEFINITION

Classification: 165/177

(under the class definition) Apparatus comprising a hollow body of tubular formation.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

38, for a pipe with merely internal baffles designed to facilitate a transfer of heat between fluids inside and outside of the pipe; and appropriate subclasses for a pipe not specialized by structure to heat exchange.