US PATENT SUBCLASS 528 / 239
.~.~.~.~ Material contains a Group IA metal atom (Li, Na, K, Rb, Cs, Fr)

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}
230  DF  .~ FROM ALDEHYDE OR DERIVATIVE THEREOF AS REACTANT {12}
232  DF  .~.~ Polymerizing in the presence of a specified material other than a reactant {4}
233  DF  .~.~.~ Material contains a metal atom {4}
239.~.~.~.~ Material contains a Group IA metal atom (Li, Na, K, Rb, Cs, Fr)

DEFINITION

Classification: 528/239

(under subclass 233) Subject matter wherein the specified material contains at least one atom of a Group IA metal (i.e., Li, Na, K, Rb, Cs, Fr).