US PATENT SUBCLASS 528 / 56
.~.~.~.~ Material contains a 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}
44  DF  .~ FROM REACTANT HAVING AT LEAST ONE -N=C=X GROUP (WHEREIN X IS A CHALCOGEN ATOM) AS WELL AS PRECURSORS THEREOF, E.G., BLOCKED ISOCYANATE, ETC. {17}
48  DF  .~.~ Process of polymerizing in the presence of a specified material other than reactant {5}
55  DF  .~.~.~ Material contains at least one metal atom {3}
56.~.~.~.~ Material contains a transition metal atom

DEFINITION

Classification: 528/56

(under subclass 55) Subject matter wherein the specified material contains a transition metal atom.

(1) Note. Transition metal is limited to elements of atomic numbers 21-29, 39-47, 57-79, and 89 and higher, but does not include Zn, Cd, or Hg.