US PATENT SUBCLASS 264 / 523
.~ Including application of internal fluid pressure to hollow finite length parison to expand same into conformity with female mold part

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

500  DF  DIRECT APPLICATION OF FLUID PRESSURE DIFFERENTIAL TO PERMANENTLY SHAPE, DISTORT, OR SUSTAIN WORK {14}
523.~ Including application of internal fluid pressure to hollow finite length parison to expand same into conformity with female mold part {10}
524  DF  .~.~> Production of a sealed product or a filled mercantile container {1}
526  DF  .~.~> Including use of vacuum or internal venting of parison to remove fluid after application of differential fluid pressure
527  DF  .~.~> Forming multiple containers in a single mold block from a single length of parison
528  DF  .~.~> Including internal cooling of the article after fluid pressure shaping
529  DF  .~.~> Including plural distinct steps of differential fluid pressure induced expansion {1}
531  DF  .~.~> Including shaping by mechanical means other than fluid pressure during or subsequent to fluid pressure differential shaping {3}
535  DF  .~.~> Including heating of previously formed parison to blow molding temperature
536  DF  .~.~> Including removal of flash or sprue
537  DF  .~.~> Including injection forming of parison or portion thereof {2}
540  DF  .~.~> Including extrusion {2}

DEFINITION

Classification: 264/523

Including application of internal fluid pressure to hollow finite length parison to expand same into conformity with female mold part:

(under subclass 500) Processes in which a finite length hollow parison is expanded into conformity with a female mold by the application of a differential fluid pressure.

(1) Note. A parison in general is a hollow cylindrical preform of relatively smaller diameter than length which may be sealed or open and of an overall size suitable for blow molding.

(2) Note. Excluded from this subclass are processes which deform a flat sheet by forcing it into a female mold, such is provided for in subclasses 544+.