US PATENT SUBCLASS 528 / 181
.~.~.~.~.~ At least one transition 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}
176  DF  .~.~ With polycarboxylic acid or derivative as reactant {8}
179  DF  .~.~.~ Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom {2}
180  DF  .~.~.~.~ Material contains a metal atom {1}
181.~.~.~.~.~ At least one transition metal atom


DEFINITION

Classification: 528/181

(under subclass 180) Subject matter wherein the specified material contains at least one atom of a transition metal.

(1) Note. Transition metal is limited to elements of atomic numbers 21-29, 39-47, 57-79, 88, and higher.