US PATENT SUBCLASS 264 / 52
.~.~ Utilizing expansion retarder

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

41  DF  PORE FORMING IN SITU (E.G., FOAMING, ETC.) {6}
51  DF  .~ By gas forming or expanding {3}
52.~.~ Utilizing expansion retarder

DEFINITION

Classification: 264/52

(under subclass 51) Processes wherein the expansion of the porous material is inhibited by the presence of a chemical or mechanical means other than mere confines of the mold, per se.

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55, for controlling expansion by volumetric mold capacity changes.