US PATENT SUBCLASS 257 / 722
.~.~.~ With fins

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  DF  .~.~ With gas coolant {1}
722.~.~.~ With fins

DEFINITION

Classification: 257/722

With fins:

(under subclass 721) Subject matter wherein the cooling means has fins, i.e., long, thin, blade like structures used to dissipate heat to the gas coolant.