US PATENT SUBCLASS 219 / 121.21
.~.~.~ Chamber

Current as of: June, 1999
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219 /   HD   ELECTRIC HEATING

50  DF  METAL HEATING (E.G., RESISTANCE HEATING) {19}
121.11  DF  .~ By arc {16}
121.12  DF  .~.~ Using electron beam {12}
121.21.~.~.~ Chamber {2}
121.22  DF  .~.~.~.~> Sealing
121.23  DF  .~.~.~.~> Monitoring

DEFINITION

Classification: 219/121.21

Chamber:

(under subclass 121.12) Subject matter wherein an evacuated housing structure is provided for partially or completely enclosing the workpiece.