US PATENT SUBCLASS 148 / 651
.~.~.~.~.~ Heating step follows cold 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}
579  DF  .~.~ Iron(Fe) or iron base alloy {24}
648  DF  .~.~.~ With working {4}
650  DF  .~.~.~.~ With working at or below 120'C or unspecified cold working {1}
651.~.~.~.~.~ Heating step follows cold working {1}
652  DF  .~.~.~.~.~.~> Separate cooling step follows cold working step

DEFINITION

Classification: 148/651

Heating step follows cold working:

(under subclass 650) Process wherein at least one heating operation follows a cold working operation.