US PATENT SUBCLASS 264 / 572
.~ With internal application of fluid pressure

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}
572.~ With internal application of fluid pressure {2}
573  DF  .~.~> To finite length tubular product
574  DF  .~.~> To form generally spherical product

DEFINITION

Classification: 264/572

With internal application of fluid pressure:

(under subclass 500) Processes in which fluid pressure is applied to the interior of hollow work or a hollow article.