US PATENT SUBCLASS 148 / 316
.~ Carburized or nitrided

Current as of: June, 1999
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148 /   HD   METAL TREATMENT

400  DF  STOCK {20}
316.~ Carburized or nitrided {2}
317  DF  .~.~> Nitrided {1}
319  DF  .~.~> Ferrous (i.e., iron base)

DEFINITION

Classification: 148/316

Carburized or nitrided:

(under subclass 400) Stock material wherein the surface of the material contains additional carbon or nitrogen diffused therein.

(1) Note. So called "case hardened" material is presumed to have carbon only diffused into the surface unless indicated to the contrary.