US PATENT SUBCLASS 493 / 314
.~.~ Internal fluid pressure to erect container or tube

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

309  DF  CONTAINER OR TUBE ERECTING, OPENING, OR COLLAPSING {5}
313  DF  .~ By direct application of vacuum or fluid pressure {3}
314.~.~ Internal fluid pressure to erect container or tube

DEFINITION

Classification: 493/314

Internal fluid pressure to erect container or tube:

(under subclass 313) Method or apparatus including repositioning the walls of a previously formed receptacle or hollow cylinder comprising application of superatmospheric pressure to the inwardly facing sides of the walls of the receptacle or hollow cylinder to make the interior enclosed space larger.