US PATENT SUBCLASS 528 / 319
.~.~.~.~ Material contains a polyvalent 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}
271  DF  .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
310  DF  .~.~ From imide- or lactam-containing compound, or from an amino-nitrogen containing carboxylic acid, or derivative of an amino-nitrogen-containing carboxylic acid {9}
312  DF  .~.~.~ Polymerizing in the presence of a specified material other than reactant {8}
319.~.~.~.~ Material contains a polyvalent metal atom

DEFINITION

Classification: 528/319

(under subclass 312) Subject matter wherein the specified material contains a polyvalent metal atom.

(1) Note. Polyvalent metal is limited to elements of atomic numbers 4, 12, 13, 20-33, 38-51, 56-84, 88, and higher.