US PATENT SUBCLASS 148 / 607
.~.~.~.~ Ageing, solution treating (i.e., for hardening), precipitation strengthening or precipitation hardening

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}
605  DF  .~.~.~ Nine percent or more chromium(Cr) (e.g., Stainless steel, etc.) {4}
607.~.~.~.~ Ageing, solution treating (i.e., for hardening), precipitation strengthening or precipitation hardening {1}
608  DF  .~.~.~.~.~> With working

DEFINITION

Classification: 148/607

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

(under subclass 605) Process which includes operations designated as ageing, solution treating (i.e., for hardening), precipitation strengthening or precipitation hardening.

(1) Note. See the main lines for Class 148 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 622 for other Class 148 processes treating iron alloys by ageing, solution treating, precipitation strengthening or precipitation hardening.