Telephonic communications – Private or single line system – Doorbell system
Patent
1997-03-05
1999-05-18
Zele, Krista
Telephonic communications
Private or single line system
Doorbell system
379169, 379 67, H04M1/60
Patent
active
059057874
ABSTRACT:
A doorbell response system is utilized in a dwelling. The dwelling includes a telephone, includes a telephone line connected to the telephone, and includes a doorbell and a pair of doorbell electrical wires which power the doorbell. The doorbell response system is powered by the pair of doorbell electrical wires and includes an auxiliary doorbell button, a speaker, a microphone, and apparatus to initiate the dialing of a telephone number. The doorbell response system also includes a connector to connect the microphone and speaker to the telephone line to enable a first person to converse over the microphone and speaker with a second person on the telephone line, and, includes apparatus for eliminating the dial tone in the telephone line so that the first person can so converse with the second person.
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patent: 4987589 (1991-01-01), Trell
patent: 5612994 (1997-03-01), Chen
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Appiah Charles N.
Nissle, P.C. Tod R.
Zele Krista
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