US PATENT SUBCLASS 148 / 213
.~.~.~ Utilizing attached protective shield, mask or coating

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}
210  DF  .~.~ Of selected surface area (e.g., zone, top only, etc.) {3}
213.~.~.~ Utilizing attached protective shield, mask or coating {1}
214  DF  .~.~.~.~> With noncarburizing or non-nitriding coating

DEFINITION

Classification: 148/213

Utilizing attached protective shield, mask or coating:

(under subclass 210) Process wherein a portion of a workpiece is covered with a temporary protective shield, mask or coating that prohibits the carburizing or nitridizing action in an area to which it is attached and which is not intended

to remain a part of the final product and acts in transitory manner to achieve the carburizing or nitridizing of a selective surface area.