US PATENT SUBCLASS 148 / 405
.~ Age or precipitation hardened or strengthened

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

400  DF  STOCK {20}
405.~ Age or precipitation hardened or strengthened {7}
406  DF  .~.~> Magnesium base
407  DF  .~.~> Refractory metal base
408  DF  .~.~> Cobalt base
409  DF  .~.~> Nickel base {1}
411  DF  .~.~> Copper base {3}
415  DF  .~.~> Aluminum base {1}
419  DF  .~.~> Containing over 50 percent metal, but no base metal

DEFINITION

Classification: 148/405

Age or precipitation hardened or strengthened:

(under subclass 400) Stock material which has been first heated to a relatively high temperature to cause ingredients thereof to dissolve to form a solid solution and then aged, or heated to a lower temperature for an extended period of time whereby phases are precipitated which increase the hardness, or strength, of the material.

(1) Note. Often after the first high temperature heating "solution treatment" the material is quenched to room temperature before being heated to age, or precipitate.

(2) Note. The aging, or precipitation may take place at room temperature for some material, but there must be a positive recitation of "aging", or "precipitation", or words to that effect in the claims to place a material here.

(3) Note. "Solution" treated material which has not been positively claimed as given an aging, or precipitation treatment is excluded herefrom and placed in appropriate subclasses below.