US PATENT SUBCLASS 246 / 29 R
.~.~.~ Radiant energy
Current as of:
June, 1999
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246 /
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RAILWAY SWITCHES AND SIGNALS
20
DF
BLOCK-SIGNAL SYSTEMS
{4}
27
DF
.~ Automatic {5}
28 R
DF
.~.~ Electric {18}
29 R
.~.~.~ Radiant energy {2}
30
DF
.~.~.~.~
> Hertzian wave
29 A
DF
.~.~.~.~
> Electronic gaseous ionization devices
Unofficial Alpha Subclasses: R A
DEFINITION
Classification: 246/29
(under subclass 28) Systems in which the traffic- control devices are actuated and controlled by waves of radiant energy as heat, light, etc.
SEE OR SEARCH CLASS
359, Optics: Systems (Including Communication) and Elements,
109+, for signalling systems in which intelligence is transmitted over a light or analogous beam.
455, Telecommunications,
200.1+, and the classes and subclasses specified in the Notes thereto for photocell-controlled electric circuits and photocell apparatus.