US PATENT SUBCLASS 148 / 545
.~.~.~.~ With tempering, ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening, or quenching

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}
538  DF  .~ With casting or solidifying from melt {6}
540  DF  .~.~ Iron(Fe) or iron base alloy {5}
543  DF  .~.~.~ Containing at least 1.5 percent carbon {2}
545.~.~.~.~ With tempering, ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening, or quenching

DEFINITION

Classification: 148/545

With tempering, ageing, solution treating (i.e., for

hardening), precipitation hardening or strengthening, or quenching:

(under subclass 543) Process which includes a step of tempering, ageing, solution treating (i.e., for hardening), precipitation hardening or precipitation strengthening, or quenching as a literally expressed operation.