US PATENT SUBCLASS 148 / 318-- .~.~.~ Ferrous (i.e., iron base)

US PATENT SUBCLASS 148 / 318
.~.~.~ Ferrous (i.e., iron base)

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

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

DEFINITION

Classification: 148/318

Ferrous (i.e., iron base):

(under subclass 317) Stock material which contains over 50 percent iron.