US PATENT SUBCLASS 493 / 256
.~.~.~.~ Including application of fluid pressure or vacuum to work

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  DF  .~.~.~ Tube opening and closing {3}
256.~.~.~.~ Including application of fluid pressure or vacuum to work

DEFINITION

Classification: 493/256

Including application of fluid pressure or vacuum to work:

(under subclass 255) Method or apparatus wherein manipulation of the cylindrical workpiece is effected by application of surrounding flowable medium to a surface of the workpiece.

(1) Note. Removal or air pressure by use of a vacuum so that air pressure on opposing work surfaces moves the workpiece is considered to be proper for this subclass.