US PATENT SUBCLASS 218 / 89
.~ Interposed non-conductor

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}
89.~ Interposed non-conductor {3}
90  DF  .~.~> Gas-evolving chamber
91  DF  .~.~> Liquid {14}
117  DF  .~.~> Solid

DEFINITION

Classification: 218/89

Interposed non-conductor:

(under subclass 1) Subject matter including an insulator which is used to smother the arc by being positioned between the contacts and across the path of the arc when the contacts are separated to break the circuit.