(19)
(11) EP 0 209 269 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.01.1989 Bulletin 1989/02

(43) Date of publication A2:
21.01.1987 Bulletin 1987/04

(21) Application number: 86304861.7

(22) Date of filing: 24.06.1986
(51) International Patent Classification (IPC)4: G08G 1/09, G08B 5/36
(84) Designated Contracting States:
DE GB IT

(30) Priority: 28.06.1985 US 749813

(71) Applicant: DON GILBERT INDUSTRIES, INC.
Jonesboro Arkansas 72401 (US)

(72) Inventor:
  • Bowman, Norman Earl
    Jonesboro Arkansas 72401 (US)

(74) Representative: Ackroyd, Robert et al
W.P. THOMPSON & CO. Eastcheap House Central Approach
Letchworth, Hertfordshire SG6 3DS
Letchworth, Hertfordshire SG6 3DS (GB)


(56) References cited: : 
   
       


    (54) Emergency sign


    (57) An illuminated sign (10) has a plurality of series connected light emitting diodes (22) arranged to form a perceivable intelligence and a control circuit (40) to supply power to the series connected diodes and maintain a battery (134) in a charged condition from line power and, during power failures, to supply power to the series connected diodes. The control circuit illuminates the diodes continuously during normal operation and a multivibrator (48) alternately switches the diodes on and off during a power failure.







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