US PATENT SUBCLASS 148 / 407
.~.~ Refractory metal base

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

400  DF  STOCK {20}
405  DF  .~ Age or precipitation hardened or strengthened {7}
407.~.~ Refractory metal base

DEFINITION

Classification: 148/407

Refractory metal base:

(under subclass 405) Stock material which contains over 50 percent by weight of a single metal selected from titanium, vanadium, chromium, zirconium, niobium, molybdenum, hafnium, tantalum, or tungsten.