Illuminated changeable-display sign

Details Illuminated changeable-display sign Illuminated changeable-display sign

1979-08-16

1981-08-25

Trafton, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

73359R, 73362R, 340718, 340760, 368 64, G08B 536

Patent

active

042862639

ABSTRACT:
An illuminated changeable-display sign has lamps which are visible to viewers and which are arranged in rows and columns, has light emitting diodes which are visible to the operator of that sign and which are arranged in corresponding rows and columns, and has control circuitry which enables the data displayed by the LEDS to be exactly the same as or different from the data displayed by the lamps.

REFERENCES:
patent: 2907995 (1959-10-01), Justus
patent: 3320585 (1967-05-01), Hines
patent: 3320586 (1967-05-01), Wagner
patent: 3384888 (1968-05-01), Harnden et al.
patent: 3389389 (1968-06-01), Minear
patent: 3727185 (1973-04-01), Jones et al.
patent: 4017724 (1977-04-01), Finger
patent: 4138670 (1979-02-01), Schneider et al.

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