US PATENT SUBCLASS 148 / 216
.~.~.~ Of gas composition (e.g., carbon content, etc.)

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}
206  DF  .~ Carburizing or nitriding using externally supplied carbon or nitrogen source {15}
215  DF  .~.~ Measuring, sensing, or testing {1}
216.~.~.~ Of gas composition (e.g., carbon content, etc.)

DEFINITION

Classification: 148/216

Of gas composition (e.g., carbon content, etc.):

(under subclass 215) Process which includes a step of measuring, sensing, or testing of the composition of a gaseous environment or of input or exhaust gases of the process.