US PATENT SUBCLASS 148 / 693
.~.~.~.~.~ 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}
688  DF  .~.~ Aluminum(Al) or aluminum base alloy {5}
691  DF  .~.~.~ With working above 400'C or nonspecified hot working {2}
692  DF  .~.~.~.~ Multiple working steps {1}
693.~.~.~.~.~ With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening

DEFINITION

Classification: 148/693

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

(under subclass 692) Process which includes a step of ageing, solution treating (i.e., for hardening), or 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 ageing, solution treating, or precipitation strengthening or precipitation hardening are sufficient for placement in Class 148 over the metal working classes.