US PATENT SUBCLASS 493 / 421
.~.~.~.~.~ Plural folding operations making multiple folds

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

395  DF  BENDING {6}
405  DF  .~ Folding {13}
416  DF  .~.~ With means to advance work or product {8}
419  DF  .~.~.~ Folding by buckling {1}
420  DF  .~.~.~.~ Buckle chute folding {1}
421.~.~.~.~.~ Plural folding operations making multiple folds

DEFINITION

Classification: 493/421

Plural folding operations making multiple folds:

(under subclass 420) Method or apparatus including bendingly stressing a sheet or web workpiece beyond its elastic limit at a first crease line and bendingly stressing a sheet or web workpiece beyond its elastic limit at a second time or location to form a second crease line.