US PATENT SUBCLASS 52 / 656.5
.~.~.~ For window

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}
656.1  DF  .~ Outside corner or peripherally bordered (i.e., framing, etc.) {5}
656.2  DF  .~.~ Portal frame or closure frame {4}
656.5.~.~.~ For window {1}
656.6  DF  .~.~.~.~> Metal sash or frame

DEFINITION

Classification: 52/656.5

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(under subclass 656.2) Subject matter wherein the closure portal serves primarily as a passage-way for air or light.