US PATENT SUBCLASS 528 / 237
.~.~.~.~.~ Heavy metal is a Group IVA metal atom (Ge, Sn, Pb)


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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}
236  DF  .~.~.~.~ Material contains a heavy metal atom {1}
237.~.~.~.~.~ Heavy metal is a Group IVA metal atom (Ge, Sn, Pb)


DEFINITION

Classification: 528/237

(under subclass 236) Subject matter wherein the specified material is a Group IVA metal atom, i.e., Ge, Sn, Pb.