US PATENT SUBCLASS 148 / 681
.~.~.~.~ Multiple working steps

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  DF  .~.~.~ With working above 400'C or nonspecified hot working {2}
681.~.~.~.~ Multiple working steps {1}
682  DF  .~.~.~.~.~> With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening

DEFINITION

Classification: 148/681

Multiple working steps:

(under subclass 680) Process which includes plural metal deforming steps and wherein at least one of said metal deforming steps is performed above 400 deg.C or is a nonspecified hot working.