Protection circuitry for subscriber's telephone circuit equipped

Details Protection circuitry for subscriber's telephone circuit equipped Protection circuitry for subscriber's telephone circuit equipped

1983-12-05

1986-05-27

Rubinson, Gene Z.

179 90BB, 179 90BD, H04M 1274

Patent

active

045916667

ABSTRACT:
A protective circuit for use in a subscriber's telephone circuit that includes a repertory memory and includes a battery which provides memory retention current. Circuitry permits the battery to be protected by a series current limiting resistor while maintaining sufficient voltage so that the memory maintains its integrity.

REFERENCES:
patent: 4171469 (1979-10-01), Brooks
patent: 4232200 (1980-11-01), Hestad et al.
patent: 4324954 (1982-04-01), Taylor
patent: 4475013 (1984-10-01), Lee et al.
patent: 4492820 (1985-01-01), Kennard et al.
patent: 4503291 (1985-03-01), Von Holten et al.

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