US PATENT SUBCLASS 148 / 692
.~.~.~.~ Multiple working steps

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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.~.~.~.~ Multiple working steps {1}
693  DF  .~.~.~.~.~> With ageing, solution treating (i.e., for hardening), precipitation hardening or strengthening

DEFINITION

Classification: 148/692

Multiple working steps:

(under subclass 691) Process which includes plural metal deforming steps and wherein at least one of said metal deforming steps is performed above 400 deg.C or at an unspecified hot working temperature.