Patent US3655918A successfully refreshed from Google Patents.
US3655918A
Expired / Lapsed
US
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Trunk allotter
Assignee: U S Holding Co Inc
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Filing: 1970-04-17
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Granted: 1972-04-11
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Expires: 1990-04-17
Abstract
Abstract A trunk allotter controls a number of parallel switches connected between the allotter and a number of circuits which are segregated into groups. When a switch is to be operated, there is a large supply of current which is sufficient to insure operation of at least one-and probably several-parallel switches. By its operation, the switch pre-selects an idle circuit. Then, the current is reduced to a level which is sufficient to hold only one of the parallel switches and to turn off the remainder of the switches. After the allotter operates, a counter steps on to enable the allotter to allot one of a second group of equivalent circuits.
Inventors
- 👤 Benjamin R Marbury
- 👤 Alfred M Hestad
- 👤 Jose Reines
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:39
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/58; H04Q3/62; H04Q3/625
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
111 words
A telephone system comprising a trunk allotter circuit, a plurality of trunk circuits arranged in groups, means comprising a plurality of current controlled switches connected in parallel, one side of each switch being individually associated with a corresponding one of said trunk circuits, and the other side of all of said switches being connected to a common point in said trunk allotter, means for enabling at least one of said parallel switches to fire responsive to a signal at said common point, means for thereafter reducing the number of said fired switches to one, and means for pre-assigning the trunk associated with said one fired switch to serve the next call.
Claim 2
Dependent Claim
111 words
A telephone system comprising a trunk allotter circuit, a plurality of trunk circuits arranged in groups, means comprising a plurality of current controlled switches connected in parallel, one side of each switch being individually associated with a corresponding one of said trunk circuits, and the other side of all of said switches being connected to a common point in said trunk allotter, means for enabling at least one of said parallel switches to fire responsive to a signal at said common point, means for thereafter reducing the number of said fired switches to one, and means for pre-assigning the trunk associated with said one fired switch to serve the next call.
Claim 3
Dependent Claim
17 words
The system of claim 1 and means for precluding the pre-assignment of any trunk twice in succession.
Claim 4
Dependent Claim
59 words
The system of claim 1 and means effective during limited periods of time for successively enabling individual switches by groups to serve successive calls, whereby no two successive calls are served by the same group, and means responsive to said enabling means for causing said pre-assigned trunk to serve the next call immediately after said limited period of time.
Claim 5
Dependent Claim
54 words
The system of claim 3, and means for enabling all of said switches after said pre-assigned trunk has had an opportunity to serve a call after said limited period of time, whereby any trunk in any group may be pre-assigned if the trunk pre-assigned during the said limited period of time failed to operate.
Claim 6
Dependent Claim
61 words
A trunk allotter comprising means for selecting one of many trunk circuits, means for rotating the selections so that the same trunk circuit is not selected twice in succession, means for causing said selected trunk circuit to operate, and means for thereafter enabling any one among all of said trunk circuits to be selected if said selected circuit fails to operate.
Claim 7
Dependent Claim
61 words
A trunk allotter comprising means for selecting one of many trunk circuits, means for rotating the selections so that the same trunk circuit is not selected twice in succession, means for causing said selected trunk circuit to operate, and means for thereafter enabling any one among all of said trunk circuits to be selected if said selected circuit fails to operate.
Claim 8
Dependent Claim
20 words
The allotter of claim 5, wherein said selecting means comprises a plurality of current controlled switches that fire at random.
Claim 9
Dependent Claim
42 words
The allotter of claim 6 wherein said switches are a plurality of general purpose diodes, each of said diodes having electronic latch means individually associated therewith, said latch circuit providing means for holding fired diodes and barring selection of a fired diode.
Claim 10
Dependent Claim
28 words
The allotter of claim 7 and class of service means for barring use of said allotter by a subscriber who is not entitled to so use the allotter.
Claim 11
Dependent Claim
44 words
The allotter of Claim 8 and means for thereafter monitoring the use of said selected trunk circuit, and restricting means for preventing a non-barred subscriber from thereafter using said selected trunk circuit in a manner which is restricted by said class of service means.
Claim 12
Dependent Claim
65 words
The network of Claim 9 and a common bus for sending class of service signals to said class of service means, and restricting means, a gate circuit connected to said common bus, means in said gate circuit for reflecting a predetermined impedance to said bus during non-signal conditions on said bus, and means responsive to signal conditions on said bus for increasing said reflected impedance.
Claim 13
Dependent Claim
40 words
The allotter of Claim 8 and means for sending a class of service signal over a common bus to said class of service means, and means responsive to said signal for increasing the impedance of said class of service means.
Claim 14
Dependent Claim
85 words
A switching network comprising a plurality of diodes connected on one side to a common bus and connected on the other side to a plurality of individually associated latch circuits, means responsive to the application of a potential to said common bus for firing at least one of said latch circuits, means for thereafter reducing the number of said fired latch circuits, to one, and means for holding said one latch circuit in a fired condition to preclude a second firing of said latch circuit.
Claim 15
Dependent Claim
85 words
A switching network comprising a plurality of diodes connected on one side to a common bus and connected on the other side to a plurality of individually associated latch circuits, means responsive to the application of a potential to said common bus for firing at least one of said latch circuits, means for thereafter reducing the number of said fired latch circuits, to one, and means for holding said one latch circuit in a fired condition to preclude a second firing of said latch circuit.
Claim 16
Dependent Claim
32 words
The network of claim 12 wherein each of said latch circuits comprises a PNP and an NPN transistor, the base of each transistor being connected to the collector of the other transistor.
Claim 17
Dependent Claim
36 words
The network of claim 13 and means for applying an enabling signal to the emitter of a first of said transistors and connecting said other side of said diode to the emitter of said other transistor.
Claim 18
Dependent Claim
42 words
The network of claim 14 wherein said enabling means comprises means for grouping the emitters of said first one of said transistors, and stepping means for sequentially and successively applying an enabling signal to individual groups of said emitters of said transistors.
Claim 19
Dependent Claim
31 words
The network of claim 15 and means effective immediately after said sequential and successive application of saId enabling signal for applying said enabling signal to all emitters of said first transistors.
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) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |