US PATENT SUBCLASS 148 / 645
.~.~.~ With flattening, straightening, or tensioning by external force

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}
645.~.~.~ With flattening, straightening, or tensioning by external force

DEFINITION

Classification: 148/645

With flattening, straightening or tensioning by external force:

(under subclass 579) Process wherein the metal workpiece is subjected to a flattening, straightening, or tensioning operation which utilizes an external force.

(1) Note. The tensioning applies external pulling force in diverse directions to the metal workpiece without any actual bending or plastic deformation of the workpiece during the tensioning step.