US PATENT SUBCLASS 218 / 91
.~.~ Liquid

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  DF  .~ Interposed non-conductor {3}
91.~.~ Liquid {14}
92  DF  .~.~.~> Operating mechanism structure or arrangement {4}
97  DF  .~.~.~> Housing or tank structure {2}
100  DF  .~.~.~> Disconnect switch
101  DF  .~.~.~> Polyphase
102  DF  .~.~.~> With resistor
103  DF  .~.~.~> Arcing chamber {3}
107  DF  .~.~.~> Contact structure {1}
109  DF  .~.~.~> Valve (e.g., spring biased valve plate)
110  DF  .~.~.~> Bridging contacts
111  DF  .~.~.~> Explosion pot
112  DF  .~.~.~> Oil poor breaker
113  DF  .~.~.~> Rotary contact
114  DF  .~.~.~> Pressure generating arc control means {1}
116  DF  .~.~.~> Puffer-piston

DEFINITION

Classification: 218/91

Liquid:

(under subclass 89) Subject matter wherein the interposed non-conductor is composed of molecules that move freely among themselves but do not tend to separate like those of gases.

(1) Note. This subclass includes the circuit controllers or interrupters referred to as "oil-switches".