US PATENT SUBCLASS 246 / 44
.~.~.~.~ Wireless distant control

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

20  DF  BLOCK-SIGNAL SYSTEMS {4}
27  DF  .~ Automatic {5}
28 R  DF  .~.~ Electric {18}
41  DF  .~.~.~ Direct current, normally closed, track circuit {4}
44.~.~.~.~ Wireless distant control {1}
45  DF  .~.~.~.~.~> Current reversal

DEFINITION

Classification: 246/44

(under subclass 41) Systems in which the distant signal is controlled by the change of some characteristic of the track-circuit current.

(1) Note. As the use of external line-wires is dispensed with, the system has long been known in the art as "wireless", although not wireless in the sense of the teles:graphic art or of subclass 30 of this class.

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, 34+, 41+, 58+ 95, 98, 128+, and 130, for track-circuit systems.

38, 50 and 60, for wireless systems.

SEE OR SEARCH CLASS

340, Communications: Electrical, 825+, for selective-signaling systems of general application.