US PATENT SUBCLASS 428 / 36.91
.~.~.~ Multilayer (continuous layer)

Current as of: June, 1999
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428 /   HD   STOCK MATERIAL OR MISCELLANEOUS ARTICLES

34.1  DF  HOLLOW OR CONTAINER TYPE ARTICLE (E.G., TUBE, VASE, ETC.) {7}
35.7  DF  .~ Polymer or resin containing (i.e., natural or synthetic) {9}
36.9  DF  .~.~ Open-ended, self-supporting conduit, cylinder, or tube-type article {1}
36.91.~.~.~ Multilayer (continuous layer)

DEFINITION

Classification: 428/36.91

Multilayer (continuous layer):

(under subclass 36.9) Article* which contains two or more layers.

(1) Note. See subclass 34.6, Notes (1) and (2) for what a layer is and is not and for what to do when the number of layers is unclear from the claims or the specification.