Telephone call timer

Details Telephone call timer Telephone call timer

1975-10-14

1978-05-09

Claffy, Kathleen H.

58152T, H04M 1500

Patent

active

040888398

ABSTRACT:
This invention relates to a timing unit for detachable mounting upon a conventional telephone instrument, having for its purpose the measuring of a predetermined time cycle and the emission of a signal, or a succession of time-spaced signals, when overtime charges are accumulating or are about to begin.

REFERENCES:
patent: 2629781 (1953-02-01), Feinstein
patent: 3089303 (1963-05-01), Dahl
patent: 3136114 (1964-06-01), Jauch
patent: 3184551 (1965-05-01), Curtis, Jr.
patent: 3459900 (1969-08-01), Alster et al.
patent: 3508392 (1970-04-01), Temps, Jr.
patent: 3512355 (1970-05-01), Lang
patent: 3573378 (1971-04-01), Leyburn et al.
patent: 3590161 (1971-06-01), Jacobs
patent: 3819873 (1974-06-01), Stockton et al.
patent: 3882670 (1975-05-01), Woolley
patent: 3934240 (1976-01-01), Norling

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