1975-06-10
1978-05-30
Cardillo, Jr., Raymond F.
H04M 164
Patent
active
RE0296554
ABSTRACT:
A telephone answering device wherein ringing current after a delay causes a bistable switch to latch that establishes line seizure and starts an endless announcement tape, [to play a prerecorded] playing an announcement[. After the announcement, impulse generating means on the endless tape starts a message recorder. After predetermined message time, second impulse generating means further along the endless tape returns the device to standby. Each of a plurality of spaced apart impulse generating and time determining means on the message recorder tape passing an impulse sensitive element also returns the device to standby.] to the caller; at the end of the answering cycle, an impulse unlatches the bistable switch, releasing line seizure and stopping the device. The stopping impulse is produced by means on the endless tape whose length thereby determines cycle duration or is produced by other timing means. The impulse from the endless tape stops the endless tape. At the conclusion of the announcement, the message recorder may start and the announcement loop may stop. Two amplifiers may be continuously coupled to the telephone line, one for announcement and one for message record.
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Spratt: Simple Telephone Answering Machine, Wireless World, Jul. 1956, pp. 344-346.
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