US PATENT SUBCLASS 218 / 131
.~.~.~.~.~ Getter

Current as of: June, 1999
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218 /   HD   HIGH-VOLTAGE SWITCHES WITH ARC PREVENTING OR EXTINGUISHING DEVICES

1  DF  ARC PREVENTING OR EXTINGUISHING DEVICES {14}
118  DF  .~ Vacuum {5}
121  DF  .~.~ Single-pole {3}
123  DF  .~.~.~ Contact structure {5}
130  DF  .~.~.~.~ Specific material {3}
131.~.~.~.~.~ Getter

DEFINITION

Classification: 218/131

Getter:

(under subclass 130) Subject matter including a substance introduced into the vacuum switch to increase the degree of vacuum by chemical or physical action on the residual gases generated by the arc.