US Patent Class 246
RAILWAY SWITCHES AND SIGNALS-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
1 R  DF  MISCELLANEOUS {1}
2 R  DF  TRAIN DISPATCHING {7}
19  DF  STAFF AND TABLET SYSTEMS
20  DF  BLOCK-SIGNAL SYSTEMS {4}
108  DF  TIME INDICATION, AUTOMATIC {2}
111  DF  GRADE-CROSSING TRACK PROTECTION {3}
118  DF  DRAWBRIDGE PROTECTION {1}
120  DF  ROADWAY-DEFECT PROTECTION {1}
122 R  DF  TRAIN-POSITION INDICATION {3}
125  DF  ELECTRIC AUTOMATIC HIGHWAY SIGNALS, MINE DOORS, AND GATES {3}
131  DF  INTERLOCKING {8}
164  DF  SLOTTING AND CONTROL {1}
166  DF  PILOT OR SIGNAL CARS
166.1  DF  SIGNALLING BETWEEN OCCUPANTS OF A TRAIN
167 R  DF  CAB SIGNAL OR TRAIN CONTROL {20}
208  DF  CAR-DISPLAYED CROSSING SIGNALS
209  DF  PASSENGERS' STATION SIGNALS
210  DF  TORPEDO MECHANISM {4}
217  DF  AUDIBLE SWITCH AND SIGNAL INDICATORS
218  DF  ELECTRIC ACTUATION {9}
257  DF  FLUID-MOTOR ACTUATION {3}
262  DF  MECHANICAL-MOTOR ACTUATION {1}
264  DF  POINT THROWERS {4}
270 R  DF  VEHICLE-ENERGY ACTUATION {11}
374  DF  SAFETY SIDINGS
375  DF  CONTINUOUS-RAIL CROSSING {5}
382  DF  SWITCH-CONNECTED FROGS {6}
393  DF  SWITCH STANDS {8}
415 R  DF  SWITCHES {21}
454  DF  CROSSINGS, FROGS, AND MATES {11}
473 R  DF  SIGNALS {12}
489  DF  MANUAL ACTUATION
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DIGESTS
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DIG 1  DF  Radiant energy devices
DIG 2  DF  Thermal sensing devices