Telephonic communications – Private or single line system – Having plural stations with selective calling
Patent
1995-01-27
1996-10-22
Chin, Wellington
Telephonic communications
Private or single line system
Having plural stations with selective calling
379 1, 379 34, 379 32, H04M 160, H04M 900, H04M 124, H04M 308
Patent
active
055685420
ABSTRACT:
A self-correcting intercom system with circuitry to detect faults within the circuitry and phone lines and reset the system to a pre-fault condition on the occurrence of a fault. The intercom system has an alarm system with a line control unit and a timer to reset the intercom system to a standby condition. A set up control unit includes all of the codes and signals to reset the other components of the intercom system upon activation of the set up control by the timer or the line control unit. A timer activates the set up control unit when a user initiates a call from an entrance vestibule panel to an apartment unit and no connection has been made within a certain time period. A line control unit activates the set up control when a connection is made, but a line fault such as a short circuit occurs disrupts normal communication. The system consumes electrical power only when needed.
REFERENCES:
patent: 3484561 (1969-12-01), Matthews
patent: 3728493 (1973-04-01), Ter Veen
patent: 3989908 (1976-11-01), Budrys et al.
patent: 4081614 (1978-03-01), Danquist et al.
patent: 4459434 (1984-07-01), Benning et al.
patent: 4658095 (1987-04-01), Santiago
patent: 4884034 (1989-11-01), Guzman
patent: 5321742 (1994-06-01), Stevens
Borshchevsky Max
Makaryan Mikhail
Chin Wellington
Litman Richard C.
Loomis Paul L.
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