US PATENT SUBCLASS 264 / 510
.~ Producing multilayer work or article

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.~ Producing multilayer work or article {2}
511  DF  .~.~> Including application of vacuum to hold, support, or sustain a preform against which material is molded
512  DF  .~.~> Producing hollow work or a tubular article {3}

DEFINITION

Classification: 264/510

Producing multilayer work or article:

(under subclass 500) Processes in which two or more united preforms and/or layers are reshaped or in which a layer is formed on a preform to produce a product with two or more generally contiguous layers or two or more layers are coextruded.

(1) Note. The layers may be of the same or different material so long as there is a difference in some property of the layers.

(2) Note. Uniting shaped sheets to form a hollow article is not considered to make a multilayered product and is provided for in subclass 545.