US PATENT SUBCLASS 493 / 140
.~.~.~.~ Inwardly folded flange

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}
121  DF  .~.~ Securing {6}
136  DF  .~.~.~ By interfitting of container portions {2}
140.~.~.~.~ Inwardly folded flange

DEFINITION

Classification: 493/140

Inwardly folded flange:

(under subclass 136) Method or apparatus wherein fastening is accomplished by turning a marginal extremity of a workpiece toward the interior of the receptacle to overlap and fasten another portion of the receptacle.