US PATENT SUBCLASS 340 / 921
.~.~.~.~.~ Extension of time

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

907  DF  TRAFFIC CONTROL INDICATOR {8}
916  DF  .~ Intersection normally under local controller {5}
917  DF  .~.~ Controller responsive to traffic detectors {4}
919  DF  .~.~.~ Plural cross highways at intersection each have traffic detectors {1}
920  DF  .~.~.~.~ Density determines split {1}
921.~.~.~.~.~ Extension of time

DEFINITION

Classification: 340/921

Extension of time:

(under subclass 920) Subject matter wherein the energization period for an indicator phase may be increased beyond its normal time period.