US3573386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outdialing information store for switching system
Assignee: AT&T Inc
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Filing: 1969-04-23
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Granted: 1971-04-06
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Expires: 1989-04-23
Abstract
Abstract A telephone switching system is described in which a central office and a plurality of private branch exchanges are interconnected by trunks. A serially arranged recirculating memory associated with the central office receives a calling station and trunk identity message over a data link, and the exchange and station identity codes are stored in one of a group of discrete storage areas in the memory. Calling exchange and station identity codes as addressed by the received trunk identity code may then be inserted or retrieved from the memory.
Inventors
- 👤 Richard A Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:35
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/42
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
84 words
In combination with a switching system including a central office, at least one private branch exchange including stations connected thereto, and trunks between said office and said exchange, a serially arranged circulating memory for storing information with respect to the station and trunk employed on a connection involving said exchange and said central office, control means for inserting and retrieving said information into and from said circulating memory, and means for alternatively enabling said control means from said exchange and from said central office.
Claim 2
Dependent Claim
84 words
In combination with a switching system including a central office, at least one private branch exchange including stations connected thereto, and trunks between said office and said exchange, a serially arranged circulating memory for storing information with respect to the station and trunk employed on a connection involving said exchange and said central office, control means for inserting and retrieving said information into and from said circulating memory, and means for alternatively enabling said control means from said exchange and from said central office.
Claim 3
Dependent Claim
27 words
The combination of claim 1 wherein said control means includes circulating storage means and means for transferring information between said circulating storage means and said circulating memory.
Claim 4
Dependent Claim
25 words
The combination of claim 2 wherein said transferring means includes match means for comparing the information in said circulating storage means and said circulating memory.
Claim 5
Dependent Claim
71 words
The combination of claim 3 wherein said circulating storage means comprises means for receiving said station and trunk information from said exchange, said match means comprises means for comparing the trunk information in said circulating storage means with the trunk information in said circulating memory, and said transferring means comprises means responsive to the detection of a match in said matching means for inserting said station information in said circulating memory.
Claim 6
Dependent Claim
46 words
The combination of claim 4 wherein said circulating storage means further comprises means for receiving trunk information from said central office, and said transferring means comprises means responsive to the detection of a match in said matching means for retrieving said station information from said memory.
Claim 7
Dependent Claim
39 words
The combination of claim 3 further comprising means responsive to said match means failing to detect a match between information in said circulating storage means and said circulating memory for detecting a blank storage area of said circulating memory.
Claim 8
Dependent Claim
102 words
In combination with a switching system including a central office, at least one private branch exchange having stations connected thereto, and trunks between said office and said exchange, an arrangement for identifying stations and trunks employed on connections involving said exchange and said central office, said arrangement comprising means for receiving data from an exchange corresponding to a station and a trunk employed in one such connection, circulating storage means, means for inserting codes representing said data in said circulating storage means, a serially arranged circulating memory, and means for transferring said information from said circulating storage means to said circulating memory.
Claim 9
Dependent Claim
102 words
In combination with a switching system including a central office, at least one private branch exchange having stations connected thereto, and trunks between said office and said exchange, an arrangement for identifying stations and trunks employed on connections involving said exchange and said central office, said arrangement comprising means for receiving data from an exchange corresponding to a station and a trunk employed in one such connection, circulating storage means, means for inserting codes representing said data in said circulating storage means, a serially arranged circulating memory, and means for transferring said information from said circulating storage means to said circulating memory.
Claim 10
Dependent Claim
63 words
The combination of claim 7 further comprising means for receiving data from said central office corresponding to the trunk employed in one such connection, means for inserting said trunk data from said central office in said circulating storage means, said transferring means further comprising means for transferring the station data from said circulating memory to said circulating memory to said circulating storage means.
Claim 11
Dependent Claim
22 words
The combination of claim 8 further comprising means for transferring said station data from said circulating storage means to said central office.
Claim 12
Dependent Claim
124 words
In combination with a switching system including a central office, at least one private branch exchange having stations connected thereto, and trunks between said office and said exchange, an arrangement for identifying stations and trunks employed on connections involving said exchange and said central office, and arrangement comprising means for receiving data from an exchange corresponding to a station and a trunk employed in one such connection, storage means, means for storing said received data in the form of a trunk code and a station code separately in said storage means, means for inserting in said storage means information representing the exchange code, serially arranged memory means, and means for transferring said exchange and station codes between said storage means and said memory means.
Claim 13
Dependent Claim
124 words
In combination with a switching system including a central office, at least one private branch exchange having stations connected thereto, and trunks between said office and said exchange, an arrangement for identifying stations and trunks employed on connections involving said exchange and said central office, and arrangement comprising means for receiving data from an exchange corresponding to a station and a trunk employed in one such connection, storage means, means for storing said received data in the form of a trunk code and a station code separately in said storage means, means for inserting in said storage means information representing the exchange code, serially arranged memory means, and means for transferring said exchange and station codes between said storage means and said memory means.
Claim 14
Dependent Claim
15 words
The combination in accordance with claim 10 wherein said memory means includes a circulating memory.
Claim 15
Dependent Claim
15 words
The combination in accordance with claim 11 wherein said storage means includes circulating storage means.
Claim 16
Dependent Claim
25 words
The combination in accordance with claim 12 wherein said transferring means includes means for exchanging information between said circulating memory and said circulating storage means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |