US PATENT SUBCLASS 138 / 139
.~.~ Metal liner

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

118  DF  FLEXIBLE {8}
137  DF  .~ Distinct layers {2}
139.~.~ Metal liner

DEFINITION

Classification: 138/139

(under subclass 137) Device wherein at least one of the distinct layers is a metal liner.

(1) Note. The liner includes a metal sleeve or axially spaced metal elements.

SEE OR SEARCH THIS CLASS, SUBCLASS:

127, for a metal liner in distinct layer braided, interlaced, knitted or woven pipe.

131, for a spirally wound metal core.

134+, for a spirally wound metal liner.