US PATENT SUBCLASS 528 / 156
.~.~.~ Two or more aldehydes or derivatives

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
86  DF  .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15}
129  DF  .~.~ With aldehyde or derivative {18}
156.~.~.~ Two or more aldehydes or derivatives

DEFINITION

Classification: 528/156

(under subclass 129) Subject matter wherein a phenol or inorganic phenolate is reacted with at least two distinct aldehydes or derivatives or mixtures thereof.