US PATENT SUBCLASS 218 / 109
.~.~.~ Valve (e.g., spring biased valve plate)

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  DF  .~.~ Liquid {14}
109.~.~.~ Valve (e.g., spring biased valve plate)

DEFINITION

Classification: 218/109

Valve (e.g., spring biased valve plate):

(under subclass 91) Subject matter wherein a movable cover or lid which regulates the ingress and egress of fluids, such as a spring biased valve plate is included.

SEE OR SEARCH THIS CLASS, SUBCLASS:

66, for puffer piston circuit interrupter.