US PATENT SUBCLASS 138 / 150
.~ With spiral seam

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

140  DF  DISTINCT LAYERS {8}
150.~ With spiral seam

DEFINITION

Classification: 138/150

(under subclass 140) Device wherein at least one layer has a spiral seam therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

129+, for spirally seamed flexible pipe.

144, for a spirally seamed, bonded, plural layer pipe.