US PATENT SUBCLASS 493 / 255
.~.~.~ Tube opening and closing

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}
186  DF  .~ Pliable container (e.g., bag, envelope, etc.) {9}
243  DF  .~.~ Including folding {8}
255.~.~.~ Tube opening and closing {3}
256  DF  .~.~.~.~> Including application of fluid pressure or vacuum to work
257  DF  .~.~.~.~> By roller having gripper engaging end edge of tube {1}
259  DF  .~.~.~.~> By means engaging end edge of tube

DEFINITION

Classification: 493/255

Tube opening and closing:

(under subclass 243) Method or apparatus comprising manipulating a flattened cylindrical workpiece at an end portion to pull one wall away form an opposite wall and further manipulating the cylindrical workpiece seal the end portion and thereby make a container.