US PATENT SUBCLASS 52 / 731.2-- .~.~.~ Forms hollow enclosure (e.g., box beam)

US PATENT SUBCLASS 52 / 731.2
.~.~.~ Forms hollow enclosure (e.g., box beam)

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}
731.1	DF	.~.~ Structural support {2}
731.2		.~.~.~ Forms hollow enclosure (e.g., box beam) {3}
731.3	DF	.~.~.~.~> Having interlocking feature
731.4	DF	.~.~.~.~> Upright {1}
731.6	DF	.~.~.~.~> For vehicle

DEFINITION

Classification: 52/731.2

Forms hollow enclosure (e.g., box beam):

(under subclass 730.1) Structure wherein the elongated members are joined together at their longitudinal edges to form a hollow enclosure.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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

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.).