US PATENT SUBCLASS 148 / 570
.~.~.~.~ Of hollow bodies (e.g., pipe, sphere, etc.)

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}
566  DF  .~.~ Electric heating with work as conductor (e.g., alternating current, induction, etc.) {2}
567  DF  .~.~.~ Induction {6}
570.~.~.~.~ Of hollow bodies (e.g., pipe, sphere, etc.) {1}
571  DF  .~.~.~.~.~> Inside only

DEFINITION

Classification: 148/570

Of hollow bodies (e.g., pipe, sphere, etc.):

(under subclass 567) Process wherein the metal or metal alloy workpiece being treated is hollow.