US PATENT SUBCLASS 219 / 121.22
.~.~.~.~ Sealing

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  DF  .~.~.~ Chamber {2}
121.22.~.~.~.~ Sealing

DEFINITION

Classification: 219/121.22

Sealing:

(under subclass 121.21) wherein vacuum or subatmospheric pressure securing means is provided on the chamber.