Emergency sign

Details Emergency sign Emergency sign

1986-11-12

1987-07-21

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

40570, 307 66, 315 86, G08B 700

Patent

active

046821473

ABSTRACT:
An illuminated exit sign having a plurality of series connected light emitting diodes arranged to form the word "exit" and a control circuit for supplying power to the series connected diodes from line power and, during power failures, from battery power. The control circuit illuminates the diodes continuously during normal operation and alternately switches the diodes on and off during a power failure.

REFERENCES:
patent: 3659179 (1972-04-01), Barker et al.
patent: 3795818 (1974-03-01), Beaman et al.
patent: 3869639 (1975-03-01), Herzog
patent: 4071749 (1978-01-01), Balogh
patent: 4225792 (1980-09-01), Fahey
patent: 4238690 (1980-12-01), Clarke
patent: 4271408 (1981-06-01), Teshima et al.
patent: 4298869 (1981-11-01), Okuno
patent: 4354118 (1982-10-01), Spencer
patent: 4386308 (1983-05-01), Emile, Jr. et al.
patent: 4388615 (1983-06-01), Ford et al.
patent: 4395639 (1983-07-01), Bring
patent: 4489308 (1984-12-01), Logan, Jr. et al.
patent: 4544910 (1985-10-01), Hoberman
Markus, John, Sourcebook of Electronic Circuits, McGraw-Hill, 1968, p. 593.

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