US PATENT SUBCLASS 521 / 58
.~.~.~ Expanding utilizing plural expansion steps

Current as of: June, 1999
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521 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {3}
50  DF  .~ CELLULAR PRODUCTS OR PROCESSES OF PREPARING A CELLULAR PRODUCT, E.G., FOAMS, PORES, CHANNELS, ETC. {27}
56  DF  .~.~ Particle which is expandible, process of preparing an expandible particle, or process of expanding a particle to form a cellular product {4}
58.~.~.~ Expanding utilizing plural expansion steps

DEFINITION

Classification: 521/58

Expanding utilizing plural expansions steps:

(under subclass 56) Subject matter wherein the expansion steps occur in a plurality of stages.

(1) Note. A continuous expansion step is not considered as being a "plurality of stages" and is properly classified elsewhere.