US PATENT SUBCLASS 264 / 235.8
.~.~.~.~ Biaxial stretching of film

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

232  DF  DISPARATE TREATMENT OF ARTICLE SUBSEQUENT TO WORKING, MOLDING, OR SHAPING {2}
234  DF  .~ Effecting temperature change {3}
235  DF  .~.~ Annealing {1}
235.6  DF  .~.~.~ After stretching running or indefinite length work {1}
235.8.~.~.~.~ Biaxial stretching of film

DEFINITION

Classification: 264/235.8

Biaxial stretching of film:

(under subclass 235.6) Process in which the stretching which precedes the annealing is performed in two perpendicular directions on planar material.

(1) Note. Where all claims of a patent, classified herein, require a post-stretching heat treatment, the patent is preferably not cross-referenced to subclass 290.2.

SEE OR SEARCH THIS CLASS, SUBCLASS:

290.2, for biaxial stretching of film, per se.