US PATENT SUBCLASS 423 / 409
.~.~ Metal or ammonium containing

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

351  DF  NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID) {5}
406  DF  .~ Binary compound {2}
409.~.~ Metal or ammonium containing {3}
410  DF  .~.~.~> Azide
411  DF  .~.~.~> Titanium or zirconium containing
412  DF  .~.~.~> Aluminum containing

DEFINITION

Classification: 423/409

(under subclass 406) Products or processes in which the additional element is either a metal or the ammonium (NH4[supscrpt]+[end supscrpt]) radical.

(1) Note. The ammonium (NH4[supscrpt]+[end supscrpt]) radical is considered to be a single element, see (1) Note to the class definition.

SEE OR SEARCH CLASS

148, Metal Treatment,

16.6, and 317+ for processes of making case hardened (nitrided) metals and the corresponding products, the intention being to form such case hardened metal, not to form a definite compound for recovery thereof, see reference to Class 148 in Line and Search Note Section of the Class Definition (423).