Telephonic communications – Polystation line system – Automatic or unattended
Patent
1992-11-17
1995-01-31
Chin, Stephen
Telephonic communications
Polystation line system
Automatic or unattended
379183, 379 37, 379 40, H04M 100, H04M 1300
Patent
active
053864638
ABSTRACT:
A system is provided for connecting multiple elevator (700-703) speaker/microphone pairs (114a-114d) to a remote terminal (750) via a standard telephone channel (50). The system comprises generating means (116) for generating an in-use signal from within one of the elevators indicating the use of the speaker/microphone pair in the elevator. The system also includes a dialing means (100a-100d) responsive to the generating means for dialing a number associated with the remote terminal on the standard telephone channel so as to contact the remote terminal. The system further includes first isolating means (200a-200d) for isolating all remaining speaker/microphone pairs from the standard telephone channel, and first connecting means (200a-200d) for connecting the in-use speaker/microphone pair to the standard telephone channel so as to connect the in-use speaker/microphone pair to the remote terminal.
REFERENCES:
patent: 914468 (1909-03-01), Wagner et al.
patent: 972329 (1910-10-01), Bruce
patent: 1000488 (1911-08-01), Bruce
patent: 1040636 (1912-10-01), Bals
patent: 1185086 (1916-05-01), Goodrum
patent: 1185087 (1916-05-01), Goodrum
patent: 1463972 (1923-08-01), Powell
patent: 1838586 (1931-12-01), Winfield-Smith
patent: 2041879 (1936-05-01), Ulrich
patent: 2062822 (1936-12-01), Powell
patent: 2070866 (1937-02-01), Saunders
patent: 2129345 (1938-09-01), Cover
patent: 2170391 (1939-08-01), Ruth
patent: 2179652 (1939-11-01), Waite
patent: 2448428 (1948-08-01), Graybill
patent: 2543062 (1951-02-01), Ringkjob et al.
patent: 2884490 (1959-04-01), Trachsel
patent: 2887535 (1959-05-01), Craddock
patent: 3005052 (1961-10-01), Powers
patent: 3673330 (1972-06-01), Suntop et al.
patent: 4040013 (1977-08-01), Carlson
patent: 4149040 (1979-04-01), Atkinson
patent: 4249036 (1981-02-01), Kutzki
patent: 4645877 (1987-02-01), Curtin
patent: 4805210 (1989-02-01), Griffith, Jr.
patent: 4899372 (1990-02-01), Wahi et al.
patent: 4985916 (1991-01-01), Tachuk et al.
patent: 5056132 (1991-10-01), Coleman et al.
patent: 5086450 (1992-02-01), Kitagawa et al.
patent: 5173932 (1992-12-01), Johansson et al.
Chin Stephen
Kings III of America, Inc., North America
Loomis Paul
LandOfFree
Low noise multi-elevator communication system and method does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low noise multi-elevator communication system and method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low noise multi-elevator communication system and method will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1107258