US PATENT SUBCLASS 52 / 784.11
.~.~.~ Fire resistant

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

782.1  DF  COMPOSITE PREFABRICATED PANEL INCLUDING ADJUNCTIVE MEANS {7}
783.1  DF  .~ Sandwich or hollow with sheet-like facing members {13}
784.1  DF  .~.~ For door or door shutter {5}
784.11.~.~.~ Fire resistant {1}
784.12  DF  .~.~.~.~> In-turned opposed flanges form edge of door panel

DEFINITION

Classification: 52/784.11

Fire resistant:

(under subclass 784.1) Structure which is specifically designed to retard flame or the transfer of extreme heat caused by flame.

SEE OR SEARCH THIS CLASS, SUBCLASS:

783.13, for a corrugated panel for a fireproof door.

784.15, for a door which is merely insulated.