US PATENT SUBCLASS 252 / 62.57
.~.~ With scandium, yttrium, gallium, rare earth, or actinide


Current as of: June, 1999
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252 /   HD   COMPOSITIONS

62.51 R  DF  MAGNETIC {5}
62.56  DF  .~ Iron-oxygen compound containing {5}
62.57.~.~ With scandium, yttrium, gallium, rare earth, or actinide


DEFINITION

Classification: 252/62.57

(under subclass 62.56) Compositions containing scandium, yttrium, gallium or an element from the rare earth or actinide series in chemically combined form.

(1) Note. Rare earth includes an element of the Lanthanum series, atomic numbers 57-71 inclusive.

(2) Note. Actinides includes the elements of atomic numbers 89-103.