US PATENT SUBCLASS 264 / 516
.~.~.~ By insertion or application of a preform

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}
510  DF  .~ Producing multilayer work or article {2}
512  DF  .~.~ Producing hollow work or a tubular article {3}
516.~.~.~ By insertion or application of a preform

DEFINITION

Classification: 264/516

By insertion or application of a preform:

(under subclass 512) Processes in which a preform is introduced into or applied to the surface of an article or introduced into a fluent material which is formed into an article or preform.

(1) Note. This subclass does not include forming one tubular object from fluent material and then forming another layer thereon.