US PATENT SUBCLASS 228 / 218
.~.~ Using gas, vapor, vacuum, or reactive flame


Current as of: June, 1999
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228 /   HD   METAL FUSION BONDING

101  DF  PROCESS {38}
214  DF  .~ With protecting of work or filler or applying flux {5}
218.~.~ Using gas, vapor, vacuum, or reactive flame {2}
219  DF  .~.~.~> Gas or vapor {1}
221  DF  .~.~.~> Vacuum


DEFINITION

Classification: 228/218

(under subclass 214) Process wherein normal atmosphere is restricted from the environment of the bonding operation (1) by replacement with a different gaseous atmosphere, (2) by placing the work within a chamber and removing a portion or all gas from that chamber; or, (3) by engulfing the area about the bond operation with a flame that serves to consume that portion of the atmosphere considered undesirable.

SEE OR SEARCH CLASS

75, Specialized Metallurgical Processes, Compositions for Use Therein, Consolidated Metal Powder Compositions, and Loose Metal Particulate Mixtures,

709, for processes of covering the surface of molten metal to prevent contact with the ambient atmosphere.

148, Metal Treatment, for a process of significant heat treatment of metal to modify or maintain the internal physical structure (i.e., microstructure) or chemical property of metal and, also, for using a reactive or protective atmosphere. See the Class Definition, Metal casting, metal fusion bonding, machining, working classes, in Class 148 to determine what constitutes significant heat treatment. Also, see Class 148 for processes of chemical heat removing (e.g., flame cutting etc.) or burning (i.e., oxidizing) of metal that use a reactive or protective atmosphere.