US PATENT SUBCLASS 138 / 140
DISTINCT LAYERS

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

140DISTINCT LAYERS {8}
141  DF  .~> Bonded to each other {3}
145  DF  .~> Coated {1}
147  DF  .~> With mechanical means to hold layers in contact
148  DF  .~> Spaced
149  DF  .~> With intermediate insulation layer
150  DF  .~> With spiral seam
151  DF  .~> With longitudinal seam {1}
153  DF  .~> Reinforced

DEFINITION

Classification: 138/140

(under the class definition) Device having more than one layer in the pipe wall make-up.

SEE OR SEARCH THIS CLASS, SUBCLASS:

101, for distinct layer pipe wherein the transverse joint of one layer breaks joint with the transverse joint of another layer.

124+, for a distinct layer pipe wherein at least one layer is braided, interlaced, knitted or woven.

137+, for a flexible distinct layer pipe.

SEE OR SEARCH CLASS

428, Stock Material or Miscellaneous Articles, appropriate subclasses, for a stock material product including a coating, impregnation or bonded preformed layer, especially 411+, and 615+ for nonmetallic and metallic composites, respectively, defined in terms of the composition of their components.