US PATENT SUBCLASS 264 / 529
.~.~ Including plural distinct steps of differential fluid pressure induced expansion

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  DF  .~ Including application of internal fluid pressure to hollow finite length parison to expand same into conformity with female mold part {10}
529.~.~ Including plural distinct steps of differential fluid pressure induced expansion {1}
530  DF  .~.~.~> In diverse female mold cavities

DEFINITION

Classification: 264/529

Including plural distinct steps of differential fluid pressure induced expansion:

(under subclass 523) Processes in which expansion by differential fluid pressure of the parison takes place in two or more sequential steps each of which causes deformation.

(1) Note. One of the steps of expansion may be prepuffing or free expanding of the workpiece.

(2) Note. The two or more expansion steps may take place in the same or different molds, or one expansion step may be carried outside the mold, i.e., free blowing followed by blow molding, etc.