US PATENT SUBCLASS 148 / 231
.~.~.~.~ Utilizing nitrogen containing agent other than ammonia or elemental nitrogen

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}
206  DF  .~ Carburizing or nitriding using externally supplied carbon or nitrogen source {15}
225  DF  .~.~ Iron(Fe) or iron base alloy {7}
230  DF  .~.~.~ Nitriding {2}
231.~.~.~.~ Utilizing nitrogen containing agent other than ammonia or elemental nitrogen

DEFINITION

Classification: 148/231

Utilizing nitrogen containing agent other than ammonia or elemental nitrogen:

(under subclass 230) Process wherein a nitrogen containing agent other than ammonia or elemental nitrogen is utilized.