US PATENT SUBCLASS 252 / 375
.~.~ Nitrogen from air or elementary nitrogen only and hydrogen from compounds

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

372  DF  GASEOUS COMPOSITIONS {2}
374  DF  .~ Nitrogen and hydrogen containing {2}
375.~.~ Nitrogen from air or elementary nitrogen only and hydrogen from compounds {1}
376  DF  .~.~.~> Hydrogen from hydrocarbons

DEFINITION

Classification: 252/375

(under subclass 374) Compositions in which the direct source of the nitrogen is air or elementary nitrogen only and the direct source of the hydrogen is wholly or partly a chemcial compound of hydrogen.