US PATENT SUBCLASS 264 / 55
.~.~.~ Plural or incremental expansion steps

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}
54  DF  .~.~ Chemical blowing {1}
55.~.~.~ Plural or incremental expansion steps

DEFINITION

Classification: 264/55

(under subclass 54) Processes in which the chemical blowing to produce the pores is effected in two or more stages or in which the expansion takes place by means of varying expansion space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52, for incremental expansion by means of an expansion retarder.