US PATENT SUBCLASS 148 / 622
.~.~.~ 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}
579  DF  .~.~ Iron(Fe) or iron base alloy {24}
622.~.~.~ Ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening {2}
623  DF  .~.~.~.~> Overageing
624  DF  .~.~.~.~> With working

DEFINITION

Classification: 148/622

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

(under subclass 579) Process which includes operations designated as ageing, solution treating (i.e., for hardening), precipitation strengthening or precipitation hardening.

(1) Note. See the main Class 148 lines to determine placement herein over the metal working classes if metal working is present. Specifically, the presence of the terms

ageing, solution treating, or precipitation strengthening or precipitation hardening are sufficient for placement in Class 148 over the metal working classes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

545, 547, 548, or 607 for other Class 148 processes or treating iron alloys by aging, solution treating, or precipitation strengthening or precipitation hardening as a literal expression.