US PATENT SUBCLASS 264 / 2.4
.~.~ Preform

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

1.1  DF  OPTICAL ARTICLE SHAPING OR TREATING {11}
2.2  DF  .~ Changing mold size or shape during molding or with shrinkage compensation {2}
2.4.~.~ Preform

DEFINITION

Classification: 264/2.4

Preform:

(under subclass 2.2) Processes directed to the reshaping of a preform into an optical article or the treatment of such preform.