US PATENT SUBCLASS 218 / 23
.~.~ Permanent magnet

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}
22  DF  .~ Magnetic blowout {7}
23.~.~ Permanent magnet {5}
24  DF  .~.~.~> Magnetic yoke structure
25  DF  .~.~.~> Located outside switch housing
26  DF  .~.~.~> Located inside switch housing
27  DF  .~.~.~> Connected to contact
28  DF  .~.~.~> Plural coils

DEFINITION

Classification: 218/23

Permanent magnet:

(under subclass 22) Subject matter comprising a piece of hardened magnetized steel or other magnetic material used in the extinguishment of the arc.

SEE OR SEARCH THIS CLASS, SUBCLASS:

104, for arcing chamber in liquid switch.

SEE OR SEARCH CLASS

335, Electricity: Magnetically Operated Switches, Magnets, and Electromagnets,

2+, for details of permanent magnets used in electromagnetically operated switches.