Static charge detector having fail-safe voltage surge protection

Details Static charge detector having fail-safe voltage surge protection Static charge detector having fail-safe voltage surge protection

1976-12-27

1977-10-11

Caldwell, Sr., John W.

Communications: electrical

Systems

Call station

307318, 323 8, 340248R, 361117, H02H 104, G08B 2100

Patent

active

040538753

ABSTRACT:
A static charge detector of a type disclosed in U.S. Pat. No. 3,452,346 having improved fail-safe protection means against voltage surges in the event of transformer failure.

REFERENCES:
patent: 2789254 (1957-04-01), Bodle et al.
patent: 3158756 (1964-11-01), Brunner et al.
patent: 3181033 (1965-04-01), Bakker
patent: 3263092 (1966-07-01), Knauss
patent: 3284787 (1966-11-01), Voigt et al.
patent: 3519881 (1970-07-01), Engel et al.
patent: 3558830 (1971-01-01), Bender
patent: 3723812 (1973-03-01), Lynch

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