US PATENT SUBCLASS 52 / 651.04
.~.~.~.~ Having perimeter-surrounding element (e.g., helical, etc.)

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}
648.1  DF  .~ Three-dimensional space-defining {9}
651.01  DF  .~.~ Vertically oriented (e.g., tower, etc.) {4}
651.02  DF  .~.~.~ For electrical conductor (e.g., line-pole, line-tower, etc.) {2}
651.04.~.~.~.~ Having perimeter-surrounding element (e.g., helical, etc.)

DEFINITION

Classification: 52/651.04

Having perimeter-surrounding element (e.g., helical, etc.):

(under subclass 651.02) Structure including distinct members defining terminal edges or a terminal corner that delimits an area within the enclosed space in two directions, i.e., a complete frame surrounding an area.

SEE OR SEARCH THIS CLASS, SUBCLASS:

581, for an edge-to-edge connected openwork panel.

631, for a corner formed by laminate with bent facing section.

649.3+, for a settable material reinforcing structure having a perimeter-surrounding element.

660+, for an openwork planar fabric or lattice which is indefinite as to length or width.

690+, for a construction formed by side-by-side terminal edge shafts connected by cross members which construction is limited in depth only by the terminal shafts (e.g., a truss or ladder-like openwork). SEE OR SEARCH CLASS

428, Stock Material or Miscellaneous Articles,

578, for a metallic panel having a nonrectangular perimeter.