US PATENT SUBCLASS 165 / 180
.~ Diverse materials

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

177  DF  TUBULAR STRUCTURE {4}
180.~ Diverse materials

DEFINITION

Classification: 165/180

(under subclass 177) Apparatus in which the tubular structure includes elements made of different materials.

SEE OR SEARCH THIS CLASS, SUBCLASS:

133, for a heat exchanger with a coated surface.

134.1, for a protector that may be a protective liner.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits,

140+, for a pipe or tubular conduit of general application having distinct layers.