US PATENT SUBCLASS 521 / 148
.~.~.~.~ With conjugated diene 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}
146  DF  .~.~.~ From aromatic reactant {2}
148.~.~.~.~ With conjugated diene reactant

DEFINITION

Classification: 521/148

With conjugated diene reactant:

(under subclass 146) Subject matter wherein the ethylenically unsaturated aromatic reactant is reacted with a conjugated diene reactant.

(1) Note. A conjugated diene for purposes of this subclass

requires at least two ethylenic bonds separated from each other by a single nonethylenic bond, e.g., -C=C-C=C-C-

(2) Note. A compound having at least one conjugated unit as in (1) Note above is sufficient for placement into this subclass.

(3) Note. A compound such as a triene is proper herein if it contains at least one conjugated unit.