US PATENT SUBCLASS 138 / 141
.~ Bonded to each other

Current as of: June, 1999
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138 /   HD   PIPES AND TUBULAR CONDUITS

140  DF  DISTINCT LAYERS {8}
141.~ Bonded to each other {3}
142  DF  .~.~> Brazed, soldered or welded
143  DF  .~.~> Metal
144  DF  .~.~> Spirally wound layer

DEFINITION

Classification: 138/141

(under subclass 140) Device wherein at least two contacting layers are bonded to each other, by an intermediate layer.