US PATENT SUBCLASS 52 / 784.16
.~.~.~ Having a single hollow cavity

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}
784.16.~.~.~ Having a single hollow cavity

DEFINITION

Classification: 52/784.16

Having a single hollow cavity:

(under subclass 784.1) Structure in which a solitary, unfilled, completely enclosed chamber is formed within the door panel.