US PATENT SUBCLASS 52 / 783.13
.~.~.~.~ 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}
783.11  DF  .~.~ Corrugated component {5}
783.12  DF  .~.~.~ For door or door shutter {1}
783.13.~.~.~.~ Fire resistant

DEFINITION

Classification: 52/783.13

Fire resistant:

(under subclass 783.12) Structure which is specifically designed to retard flame or the transfer of extreme heat caused by flame.

SEE OR SEARCH THIS CLASS, SUBCLASS:

784.13, for a noncorrugated fire door panel.