US PATENT SUBCLASS 257 / 721
.~.~ With gas coolant

Current as of: June, 1999
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257 /   HD   ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES)

678  DF  HOUSING OR PACKAGE {18}
712  DF  .~ With provision for cooling the housing or its contents {6}
721.~.~ With gas coolant {1}
722  DF  .~.~.~> With fins

DEFINITION

Classification: 257/721

With gas coolant:

(under subclass 712) Subject matter wherein the cooling means uses a gas to provide the cooling (e.g., by convection).