Apparatus for disabling a telephone ringer

Details Apparatus for disabling a telephone ringer Apparatus for disabling a telephone ringer

2005-07-12

2005-07-12

Isen, Forester W. (Department: 2644)

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

C379S374030

Reexamination Certificate

active

06917680

ABSTRACT:
An apparatus for disabling a telephone ringer includes a light sensing device operable to produce a signal indicative of a level of ambient light; and a controller operable to receive the signal and disable the telephone ringer when the signal indicates that the ambient light has reached a predetermined level.

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patent: 5604797 (1997-02-01), Adcock
WO 97/16932 Kikinis, Selective notification method for protable electronic devices, May 1997.

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