US PATENT SUBCLASS 52 / 656.3
.~.~.~ Fireproof

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}
656.3.~.~.~ Fireproof

DEFINITION

Classification: 52/656.3

Fireproof:

(under subclass 656.2) Subject matter wherein the frame or associated door comprises material, or is constructed in a fashion, which specifically serves as a block to extreme heat or flame.

(1) Note. A closure or frame that is merely constructed of noncombustible material, such as metal or glass, is not considered proper for placement in this subclass.