Title:
Emergency power supply unit
United States Patent 3294977

Inventors:
Duncan, Edward T.
Publication Date:
12/27/1966
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Assignee:
MAINTENANCE COMPANY INC
Primary Class:
307/66
Other Classes:
307/64, 416/5, 327/530, 327/447, 315/86
International Classes:
H02J9/02; H02J9/00
US Patent References:
3114095Storage battery charging system utilizing a controlled rectifier switch responsive to the battery-load voltage
3158799Firing circuit for controlled rectifiers
3159755Emergency lighting unit
3189788Power failure responsive circuits