US PATENT SUBCLASS 534 / 15
.~ RARE EARTH METAL CONTAINING (At. No. 21, 39, 57-60 or 62-71)

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534 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8}
15.~ RARE EARTH METAL CONTAINING (At. No. 21, 39, 57-60 or 62-71) {1}
16  DF  .~.~> Containing -C(=X)X-, wherein the X's are the same or diverse chalcogens

DEFINITION

Classification: 534/15

(under subclass 1) Compounds under Class 532, ..., which contain a metal having an atomic number of (21, 39, 57 - 60 or 62 - 71).