US PATENT SUBCLASS 428 / 36.9
.~.~ Open-ended, self-supporting conduit, cylinder, or tube-type article

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.~.~ Open-ended, self-supporting conduit, cylinder, or tube-type article {1}
36.91  DF  .~.~.~> Multilayer (continuous layer)

DEFINITION

Classification: 428/36.9

Open-ended, self-supporting conduit, cylinder, or tube-type article:

(under subclass 35.7) Article* which is tubular or cylindrical, has openings at both ends, and which can hold its own structure without the aid of a filler or support.

(1) Note. The difference between the products in this subclass and a hollow strand*, fiber* or filament in subclasses 364+ is as follows: the present subclass 36.9 is the locus for a conduit type article through which a fluid passes and is generally of substantially larger size (e.g., 3-dimensional) than the strand*, fiber* or filaments found in subclasses 364+. If it is difficult to determine from the disclosure whether the article is of the type which should be classified in this subclass or in the latter, all doubts should be resolved in favor of the strand*, filament*, or fiber* and placement made in those subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

364+, for a structurally defined or coated filament*, fiber* or strand* which could be hollow or open at both ends, and see (1) Note above for the line between the two subclasses.