US PATENT SUBCLASS 148 / 680
.~.~.~ With working above 400'C or nonspecified hot working

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}
679  DF  .~.~ Copper(Cu) or copper base alloy {4}
680.~.~.~ With working above 400'C or nonspecified hot working {2}
681  DF  .~.~.~.~> Multiple working steps {1}
683  DF  .~.~.~.~> With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening

DEFINITION

Classification: 148/680

With working above 400 deg.C or nonspecified hot working:

(under subclass 679) Process wherein there is a metal deforming step that takes place at a temperature above 400 deg.C or there is nonspecified hot working.

(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.