US PATENT SUBCLASS 521 / 149
.~.~.~ From oxygen containing reactant

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}
142  DF  .~.~ Cellular product derived from ethylenically unsaturated reactants only {5}
149.~.~.~ From oxygen containing reactant

DEFINITION

Classification: 521/149

From oxygen containing reactant:

(under subclass 142) Subject matter wherein a solid polymer is derived from at least one reactant containing an oxygen atom.