US PATENT SUBCLASS 264 / 51
.~ By gas forming or expanding

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.~ By gas forming or expanding {3}
52  DF  .~.~> Utilizing expansion retarder
53  DF  .~.~> Liquid to gas phase change
54  DF  .~.~> Chemical blowing {1}

DEFINITION

Classification: 264/51

(under subclass 41) Processes wherein the voids are formed or enlarged by occluded gas which may be generated or expanded.