US PATENT SUBCLASS 423 / 353
.~.~ From nitride of metal or silicon

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}
352  DF  .~ Ammonia or ammonium hydroxide {6}
353.~.~ From nitride of metal or silicon

DEFINITION

Classification: 423/353

(under subclass 352) Processes in which the product is made from the nitride of a metal or of silicon.

(1) Note. Where a metal or metal compound is contacted alternately with free nitrogen and free hydrogen and ammonia is produced, it is assumed that the nitrogen contact produces a nitride which is converted to ammonia in the later contact with hydrogen, and classification in this subclass is proper.