US PATENT SUBCLASS 252 / 374
.~ Nitrogen and hydrogen containing

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

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

DEFINITION

Classification: 252/374

(under subclass 372) Compositions which in each case contain significant amounts of both nitrogen and hydrogen, or processes of making such compositions.