US PATENT SUBCLASS 264 / 507
.~.~.~ With axial compression

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}
505  DF  .~ Corrugating {1}
506  DF  .~.~ Of a tubular preform {2}
507.~.~.~ With axial compression

DEFINITION

Classification: 264/507

With axial compression:

(under subclass 506) Precesses in which tubular article or preform is corrugated by reduction in its length.