US PATENT SUBCLASS 52 / 784.1
.~.~ For door or door shutter

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.~.~ For door or door shutter {5}
784.11  DF  .~.~.~> Fire resistant {1}
784.13  DF  .~.~.~> In-turned opposed flanges form edge of door
784.14  DF  .~.~.~> Multicellular core
784.15  DF  .~.~.~> Insulating core
784.16  DF  .~.~.~> Having a single hollow cavity

DEFINITION

Classification: 52/784.1

For door or door shutter:

(under subclass 783.1) Structure that is intended to be used as a component of a closure for an entrance or egress.

SEE OR SEARCH THIS CLASS, SUBCLASS:

800.13+, for a door or shutter having a U-shaped channel overlapping panel edge and major faces.