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US3927271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sequence control circuit for telephone systems
Assignee: U S Holding Co Inc
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Filing: 1974-09-16
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Granted: 1975-12-16
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Expires: 1994-09-16
Abstract
Abstract A circuit is disclosed for controlling the sequence of selection of switch units such as trunk circuits, junctor circuits or other selectable switches to ensure that successive calls are made through different ones of said switches. Following seizure of a switch and subsequent release of that switch, the control unit is artificially busied against seizure as long as one available switch unit of those available has not been seized. When the final unit of a group is seized, the remaining units of the group are then released and made available for selection.
Inventors
- 👤 Generoso Acevedo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:49
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
188 words
A sequence control network for plural switches of a group within a telephone system, said network comprising a plurality of control units, each representing one of said switches, a first lead in each of said units over which the switch may be tested for availability and seized, a first and a second relay in each unit, said first relay of a unit responsive to seizure of said unit for enabling a path to the second relay of said unit, a source of potential at each unit of said group, a common lead from the potential source to all said units, means in a unit responsive to operation of the first relay of that unit for disconnecting said potential source from said common lead, and means for completing a path through any idle one of said units for operation of an enabled second relay of a busy unit for holding said second relay operated to artificially busy said unit, said disconnecting means of a last idle one of said units opening the path to the second relay of all other units to release all second relays of said units.
Claim 2
Dependent Claim
188 words
A sequence control network for plural switches of a group within a telephone system, said network comprising a plurality of control units, each representing one of said switches, a first lead in each of said units over which the switch may be tested for availability and seized, a first and a second relay in each unit, said first relay of a unit responsive to seizure of said unit for enabling a path to the second relay of said unit, a source of potential at each unit of said group, a common lead from the potential source to all said units, means in a unit responsive to operation of the first relay of that unit for disconnecting said potential source from said common lead, and means for completing a path through any idle one of said units for operation of an enabled second relay of a busy unit for holding said second relay operated to artificially busy said unit, said disconnecting means of a last idle one of said units opening the path to the second relay of all other units to release all second relays of said units.
Claim 3
Dependent Claim
45 words
A sequence control network as claimed in claim 1, wherein said second relay comprises a slow-to-operate relay, and said path completion to said second relay occurs on release of seizing current to said first relay, and said first relay held operated with said second relay.
Claim 4
Dependent Claim
43 words
A control network as claimed in claim 2, wherein each of said relays has a break-mate set of contacts, and a break-mate contact set of each first relay is included in the operating path to the second relay of all of said units.
Claim 5
Dependent Claim
103 words
A circuit for rotating selection of like switches of a group comprising a control unit for each switch of said group, first relay means in each unit responsive to seizure of the unit over a lead for busying said unit over said lead, second relay means in a unit operative after a busying of that unit over a path through contacts of relay means in any idle one of said units for artificially maintaining said busying in effect after removal of said seizure, and means in any one unit responsive to busying of all units of said group for releasing all other units.
Claim 6
Dependent Claim
103 words
A circuit for rotating selection of like switches of a group comprising a control unit for each switch of said group, first relay means in each unit responsive to seizure of the unit over a lead for busying said unit over said lead, second relay means in a unit operative after a busying of that unit over a path through contacts of relay means in any idle one of said units for artificially maintaining said busying in effect after removal of said seizure, and means in any one unit responsive to busying of all units of said group for releasing all other units.
Claim 7
Dependent Claim
47 words
A circuit as claimed in claim 4, wherein there is a first relay which comprises the means responsive to seizure of a unit, and a second relay comprises the busying means, and said second relay is slow-to-operate and said contacts comprises contacts of said first relay 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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |