Telephonic communications – Private or single line system – Doorbell system
Patent
1984-07-05
1987-01-13
Rubinson, Gene Z.
Telephonic communications
Private or single line system
Doorbell system
379370, 379375, 379422, 381190, H04M 512, H04M 900
Patent
active
046365850
ABSTRACT:
A telephone installation has two talk-listen stations each comprising a telephone case adapted to receive talking and listening means housed in a common receiver case. At least one switch is provided on the telephone case or on the receiver case and is operable as a result of the raising and setting down of the receiver case on the telephone case. Each talk-listen station has a buzzer or like means and the listening means comprises an electroacoustic piezoelectric device with metallic electrodes arranged on either side of a piezoelectric material plate, one electrode being subdivided into two partial electrodes which are not interconnected in direct current-like manner. An oscillator arrangement is provided between the partial electrodes and the other electrode which produces a dial tone in one switching position of a switch and in the other switching position one of the partial electrodes and the said other electrode form the actual listening means, the other partial electrode being disconnected.
REFERENCES:
patent: 1830035 (1931-11-01), Loeffler
patent: 1830322 (1931-11-01), Hund
patent: 2653192 (1953-09-01), Shipton
patent: 3594515 (1971-07-01), Brown
patent: 3617923 (1971-11-01), Paradysz et al.
patent: 3924073 (1975-12-01), Brandstatter
patent: 4022976 (1977-05-01), O'Brien et al.
patent: 4251694 (1981-02-01), Taylor
patent: 4374307 (1983-02-01), Haagen et al.
patent: 4472602 (1984-09-01), Bordelon et al.
Geobra Brandstatter GmbH & Co. KG
Myers Randall P.
Rubinson Gene Z.
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