US PATENT SUBCLASS 52 / 732.1
.~.~ Forms hollow enclosure

Current as of: June, 1999
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52 /   HD   STATIC STRUCTURES (E.G., BUILDINGS)

720.1  DF  SHAFT (I.E., ELONGATED RIGID STRUCTURE) {15}
730.1  DF  .~ Longitudinally related striplike sections {5}
732.1.~.~ Forms hollow enclosure {2}
732.2  DF  .~.~.~> Having interlocking feature
732.3  DF  .~.~.~> Upright

DEFINITION

Classification: 52/732.1

Forms hollow enclosure:

(under subclass 730.1) Structure in which the members are joined together at their longitudinal edges to form a hollow shaft.

SEE OR SEARCH THIS CLASS, SUBCLASS:

648.1+, for a three dimensional space surrounding structure (e.g., box type truss, mast, etc.).

730.4+, for closure related strips which are tubular.

731.2+, for tubular structural supports.

SEE OR SEARCH CLASS

138, Pipes and Tubular Conduits, for tubular structures of more general application. Features considered suitable for Class 52 include: a tubular structure with attached features or discrete projecting portions having a rigidifying function other than merely forming or supporting the tube wall (e.g., a tube with support means for structural elements such as a beam, panel, etc., means such as ribs or defined shapes acting to resist transverse loading, open structure such as box girders, or masts, etc.).