1975-08-11
1977-03-01
Claffy, Kathleen H.
179 18AD, H04M 172, H04M 904
Patent
active
040103323
ABSTRACT:
An intercommunication link for a multiple link key telephone system with a combination lamp-button on each handset for each available link. In each link, a line seeking intercom service is sensed to operate a relay in the link selected. A lamp flash signal on the lamp of the selected link is initiated. In this condition, all other links are disabled and none can be accessed when one link is in the lamp flashing condition. The called local number of the desired intercom station is dialed and when the called station line is answered, a second relay in the selected link operates to release the first relay. On operation of the second relay, a steady lamp indication is sent to both stations in the conversation. Other free links may be accessed at this time. Thus, only during this intercom signaling phase are the remaining free links affected.
REFERENCES:
patent: 3299217 (1967-01-01), Burns
patent: 3778554 (1973-12-01), Weiner
patent: 3860763 (1975-01-01), Sudoh et al.
patent: 3931478 (1976-01-01), Warman
Chaban M. M.
Claffy Kathleen H.
International Telephone and Telegraph Corporation
Myers Randall P.
Raden J. B.
LandOfFree
Link circuit for intercom unit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Link circuit for intercom unit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Link circuit for intercom unit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1353696