US PATENT SUBCLASS 419 / 58
.~.~.~ Hydrogen or hydrogen plus nitrogen (Nitrogen per se in 57)

Current as of: June, 1999
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419 /   HD   POWDER METALLURGY PROCESSES

1  DF  POWDER METALLURGY PROCESSES WITH HEATING OR SINTERING {16}
56  DF  .~ Special medium during sintering {1}
57  DF  .~.~ Special atmosphere {3}
58.~.~.~ Hydrogen or hydrogen plus nitrogen (Nitrogen per se in 57)

DEFINITION

Classification: 419/58

(under subclass 57) Hydrogen or hydrogen plus nitrogen (N257): Processes in which the special atmosphere comprises hydrogen with or without nitrogen being present.

SEE OR SEARCH THIS CLASS, SUBCLASS:

57, for the use of nitrogen as the special atmosphere without also using hydrogen.