US PATENT SUBCLASS 423 / 90
.~.~ Detinning

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

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
89  DF  .~ Group IVA metal (Ge, Sn, or Pb) {5}
90.~.~ Detinning {1}
91  DF  .~.~.~> Treating with free halogen or hydrogen halide

DEFINITION

Classification: 423/90

(under subclass 89) Processes in which the compound comprises tin and is obtained by treating an article or waste material of a mixture of metals which includes tin (e.g., terne plate,

tin plate, cans, etc.).

SEE OR SEARCH CLASS

134, Cleaning and Liquid Contact With Solids,

2+, for a process of treating articles or material for the purpose of cleaning or removing foreign matter therefrom, not to remove or strip a metal coating to recover the metal.