US PATENT SUBCLASS 423 / 618
.~.~ Group IVA metal (Ge, Sn, or Pb)

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

579  DF  OXYGEN OR COMPOUND THEREOF {4}
592  DF  .~ Metal containing {12}
618.~.~ Group IVA metal (Ge, Sn, or Pb) {1}
619  DF  .~.~.~> Lead {1}

DEFINITION

Classification: 423/618

(under subclass 592) Products or processes wherein the metal is germanium, tin or lead (Group IV A).