US PATENT SUBCLASS 246 / 140
.~.~ Electrically controlled valve

Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

131  DF  INTERLOCKING {8}
139  DF  .~ Fluid-pressure actuation {2}
140.~.~ Electrically controlled valve {1}
141  DF  .~.~.~> Return-release indication

DEFINITION

Classification: 246/140

(under subclass 139) Subject matter in which the units are actuated by electrically-controlled fluid-pressure means.

(1) Note. This type is known to the Railway Signal Association as "electro pneumatic interlocking".

SEE OR SEARCH THIS CLASS, SUBCLASS:

93, 94, 95, 258, and 259, for electro-fluid-pressure systems.

SEE OR SEARCH CLASS

303, Fluid-Pressure and Analogous Brake System, 15+, and 20 for railway-brakes actuated by electrically-controlled fluid-pressure means.