US PATENT SUBCLASS 148 / 621
.~.~.~ Highly alloyed (i.e., greater than 10 percent alloying elements)

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}
621.~.~.~ Highly alloyed (i.e., greater than 10 percent alloying elements)

DEFINITION

Classification: 148/621

Highly alloyed (i.e., greater than 10 percent alloying elements):

(under subclass 579) Process wherein the iron based alloy contains greater than a total of 10 percent alloying elements.

(1) Note. Steels of the types referred to as high speed tool alloys, maraging alloys, and iron-based super alloys are assumed to be highly alloyed for this subclass lacking an indication to the contrary.