US PATENT SUBCLASS 264 / 288.8
.~.~.~ Nonuniform product (e.g., porous, etc.) or with tensioning before application of heat

Current as of: June, 1999
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264 /   HD   PLASTIC AND NONMETALLIC ARTICLE SHAPING OR TREATING: PROCESSES

239  DF  MECHANICAL SHAPING OR MOLDING TO FORM OR REFORM SHAPED ARTICLE {10}
280  DF  .~ Reshaping running or indefinite-length work {5}
288.4  DF  .~.~ Stretching by applying tension {5}
288.8.~.~.~ Nonuniform product (e.g., porous, etc.) or with tensioning before application of heat

DEFINITION

Classification: 264/288.8

Nonuniform product (e.g., porous, etc., or with tensioning before application of heat):

(under subclass 288.4) Process including a step of applying tension to a workpiece before the workpiece is heated, e.g., "prestretching", etc., or wherein the process results in an article or running length differing from a uniform and uniform-appearing fiber, tow, or film in a specified way, whether the variation be desired or undesired, e.g., knots, color variations, etc.

(1) Note. The process may produce the variations or may tend to minimize variations in the original workpiece.

(2) Note. The tensioning may or may not result in a change of shape (cold-stretching).

SEE OR SEARCH THIS CLASS, SUBCLASS:

41+, for a process which includes pore-forming in situ.

103, for a process which includes formation of a textile fabric.

154, for a process where stretching itself causes pores to be formed.

287, for a process in which a film is corrugated and the corrugations are minimized or eliminated by later stretching.