US PATENT SUBCLASS 52 / 730.4
.~.~.~ Forms hollow enclosure (e.g., tubular)

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}
730.3  DF  .~.~ Closure related (e.g., stile, sash bar, mullion, etc.) {2}
730.4.~.~.~ Forms hollow enclosure (e.g., tubular) {1}
730.5  DF  .~.~.~.~> Having interlocking feature

DEFINITION

Classification: 52/730.4

Forms hollow enclosure (e.g., tubular):

(under subclass 730.3) Subject matter, wherein the cross-section of the assembly is hollow.