US PATENT SUBCLASS 493 / 168
.~.~.~.~ Forming hollow wall or 270 degree folded edge

Current as of: June, 1999
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493 /   HD   MANUFACTURING CONTAINER OR TUBE FROM PAPER; OR OTHER MANUFACTURING FROM A SHEET OR WEB

51  DF  CONTAINER MAKING {2}
52  DF  .~ Rigid container (e.g., box, carton, cap, cup, etc.) {10}
162  DF  .~.~ Folding {7}
167  DF  .~.~.~ By plunger {6}
168.~.~.~.~ Forming hollow wall or 270 degree folded edge

DEFINITION

Classification: 493/168

Forming hollow wall or 270 deg. folded edge:

(under subclass 167) Method or apparatus of making a receptacle having a side formed of an inner and outer layer to enclose an open space or having a marginal lip that is formed of a bent overedge that extends about at least three sides of enclosed space.