US PATENT SUBCLASS 528 / 139
.~.~.~.~ Material contains an aluminum or heavy metal atom

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}
137  DF  .~.~.~ Polymerizing in the presence of a specified material other than a reactant {9}
139.~.~.~.~ Material contains an aluminum or heavy metal atom

DEFINITION

Classification: 528/139

(under subclass 137) Subject matter wherein the specified material contains at least one atom of aluminum or of a heavy metal.

(1) Note. Heavy metal denotes a metal atom having a specific gravity greater than four.