Telephone accessory

Details Telephone accessory Telephone accessory

1989-08-28

1991-03-05

Schreyer, Stafford D.

Telephonic communications

Diagnostic testing, malfunction indication, or electrical...

Monitoring

379 61, 379377, H04M 100

Patent

active

049982710

ABSTRACT:
An apparatus for use with a telephone including, in one embodiment, a detector for detecting when the telephone is in an off-hook condition and disconnect circuit for eliminating the off-hook condition when the off-hook condition is caused by the telephone so that phone calls may be received by the line. An alarm responsive to the detector produces a warning of the off-hook condition if another phone on the line is off hook.

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patent: 4390750 (1983-06-01), Bartelink
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patent: 4555057 (1985-11-01), Foster
patent: 4664109 (1987-02-01), Takeda
patent: 4682348 (1987-07-01), Dawson
patent: 4686697 (1987-08-01), Shapiro
patent: 4712097 (1987-12-01), Hashimoto
patent: 4712230 (1987-12-01), Rice
patent: 4741022 (1988-04-01), Chebra
patent: 4748654 (1988-05-01), Gray
patent: 4791658 (1988-12-01), Simon
patent: 4805210 (1989-02-01), Griffith

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