US PATENT SUBCLASS 52 / 672
.~.~.~.~ Nonexpanded, channel-shaped ribs

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

633  DF  OPENWORK; E.G., TRUSS, TRELLIS, GRILLE, SCREEN, FRAME, OR REBAR CHAIR {12}
660  DF  .~ Fabric or lattice; e.g., indeterminate grating {7}
670  DF  .~.~ Expanded metal {1}
671  DF  .~.~.~ Laterally displaced sections; e.g., corrugated {1}
672.~.~.~.~ Nonexpanded, channel-shaped ribs

DEFINITION

Classification: 52/672

(under subclass 671) Structure in which the laterally displaced sections are of open channel form, e.g., U-shaped, and are formed in strips which have not been expanded, e.g., the ribs are of imperforate metal or have substantially imperforate areas.