US PATENT SUBCLASS 528 / 358
.~.~.~.~.~ Material contains a Group IA (Li, Na, K, Rb, Cs, Fr) or Group IIA metal atom (Be, Mg, Ca, Sr, Ba, Ra)

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}
354  DF  .~.~ From compound having -C-C(=O)-O-C- group as part of a heterocyclic ring, e.g., lactone, etc. {2}
355  DF  .~.~.~ Polymerizing in the presence of a specified material other than a reactant {2}
357  DF  .~.~.~.~ Material contains a metal atom {1}
358.~.~.~.~.~ Material contains a Group IA (Li, Na, K, Rb, Cs, Fr) or Group IIA metal atom (Be, Mg, Ca, Sr, Ba, Ra)

DEFINITION

Classification: 528/358

(under subclass 357) Subject matter wherein the specified material contains a Group IA (Li, Na, K, Rb, Cs, Fr) or Group IIA (Be, Mg, Ca, Sr, Ba, Ra) metal atom.