US3579255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Outgoing trunk connection for pabx
Assignee: International Standard Electric Corp
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Filing: 1968-06-18
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Granted: 1971-05-18
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Expires: 1988-06-18
Abstract
Abstract A central marker, connected to a PABX, supervises the busy condition of trunk junctors and external registers. If, in an internal register, a call for a trunk line has been detected and all the external registers are busy, but at least one trunk junctor is available, the marker restores the time control of the internal register. As soon thereafter as an external register becomes available, the marker is requested again and the trunk connection is initiated.
Inventors
- 👤 Walter Kaiser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:53
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A circuit arrangement for connecting private automatic branch exchanges to external registers and trunk junctors comprising: a central marker, external registers, trunk junctors, switching means arranged in the central marker to supervise the busy condition of the external registers and the trunk junctors, an internal register associated with said private automatic branch exchange, means in said central marker for applying time control to said internal register responsive to determinations by said switching means that said external registers are busy and at least one trunk junctor is idle, means in the internal register for disconnecting the central marker when time control is applied to the internal register, and means associated with said internal register to request the central marker as soon as the switching means in the central marker provides an indication to the internal register that an external register has become available.
Claim 2
Dependent Claim
142 words
A circuit arrangement for connecting private automatic branch exchanges to external registers and trunk junctors comprising: a central marker, external registers, trunk junctors, switching means arranged in the central marker to supervise the busy condition of the external registers and the trunk junctors, an internal register associated with said private automatic branch exchange, means in said central marker for applying time control to said internal register responsive to determinations by said switching means that said external registers are busy and at least one trunk junctor is idle, means in the internal register for disconnecting the central marker when time control is applied to the internal register, and means associated with said internal register to request the central marker as soon as the switching means in the central marker provides an indication to the internal register that an external register has become available.
References Cited (Backward Citations)
US2258854A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |