US PATENT SUBCLASS 148 / 671
.~.~.~.~.~ With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening

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

95  DF  PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17}
559  DF  .~ Heating or cooling of solid metal {22}
668  DF  .~.~ Refractory metal (i.e., titanium(Ti), zirconium(Zr), hafnium(Hf), vanadium(V), niobium(Nb), columbium(Cb), tantalum(Ta), chromium(Cr), molybdenum(Mo), tungsten(W)), or alloy base thereof {3}
669  DF  .~.~.~ Titanium(Ti) or titanium base alloy {1}
670  DF  .~.~.~.~ With working {1}
671.~.~.~.~.~ With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening

DEFINITION

Classification: 148/671

With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening:

(under subclass 670) Process which includes a step of ageing, solution treating (i.e., for hardening), precipitation hardening or precipitation strengthening as a literally expressed condition.

(1) Note. See the main definition for this class (148), Lines With Other Classes and Within This Class, "A. Metal Casting, Metal Fusion Bonding, etc.," to determine placement over the metal working classes, if metal working is present. Specifically, the presence of the terms aging, solution treating, for precipitation strengthening or precipitation hardening are sufficient for placement in Class 148 over the metal working classes.