US3624304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Branch-line switching arrangement for time-sharing communication system
Assignee: Italtel SpA
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Filing: 1969-07-16
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Granted: 1971-11-30
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Expires: 1989-07-16
Abstract
Abstract A group of subscribers associated with a common exchange are divided into subgroups connectable by way of individual line switches to a common transmission line via respective branch lines whose residual energies are individually discharged, between successive conversation time slots, into normally disconnected impedances matching the characteristic impedances of these branch lines; in like manner, and at the same time, the common transmission line is also discharged into a normally disconnected matching impedance.
Inventors
- 👤 Ferdinando Formenti
- 👤 Giuseppe Valbonesi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:11
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/10; H04J3/20; H04M; H04M9/00; H04M9/02; H04M9/022; H04M9/025; H04Q; H04Q11/00; H04Q11/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
176 words
A communication system with a network of transmission lines including at least one main line, a plurality of branch lines connected in parallel across said main line, and a plurality of subscriber lines connected in parallel across each of said branch lines; a set of normally open individual line switches provided in said branch lines near their junctions with said main line and in said subscriber lines near their junctions with the respective branch lines; selector means for closing different combinations of said line switches during recurrent time intervals to establish communication between different pairs of said subscribers; individual terminating impedances for each of said branch lines and for said main line substantially matching the characteristic impedances of the respective lines in the open condition of said line switches; normally open circuit breakers in series with said terminating impedances; and timer means for closing at least certain of said circuit breakers during instants between said recurrent time intervals for dissipating residual energy from at least the lines participating in the establishment of the immediately preceding communication.
Claim 2
Dependent Claim
176 words
A communication system with a network of transmission lines including at least one main line, a plurality of branch lines connected in parallel across said main line, and a plurality of subscriber lines connected in parallel across each of said branch lines; a set of normally open individual line switches provided in said branch lines near their junctions with said main line and in said subscriber lines near their junctions with the respective branch lines; selector means for closing different combinations of said line switches during recurrent time intervals to establish communication between different pairs of said subscribers; individual terminating impedances for each of said branch lines and for said main line substantially matching the characteristic impedances of the respective lines in the open condition of said line switches; normally open circuit breakers in series with said terminating impedances; and timer means for closing at least certain of said circuit breakers during instants between said recurrent time intervals for dissipating residual energy from at least the lines participating in the establishment of the immediately preceding communication.
Claim 3
Dependent Claim
40 words
A system as defined in claim 1 whErein said network includes at least one additional main line, with associated branch lines and subscriber lines connected across the latter, and a common line having said main lines connected in parallel thereacross.
Claim 4
Dependent Claim
33 words
A system as defined in claim 2 wherein said common line is provided with an additional terminating impedance and with a normally open circuit breaker, controlled by said timer means, in series therewith.
Claim 5
Dependent Claim
38 words
A system as defined in claim 1 wherein the terminating impedance and circuit breaker of each branch line are connected thereacross at a point separated from said main line by the line switch of the respective branch line.
Claim 6
Dependent Claim
33 words
A system as defined in claim 1 wherein all said circuit breakers are connected to said timer means for periodic and concurrent reversal after each time interval allotted to the establishment of communication.
Claim 7
Dependent Claim
36 words
A system as defined in claim 1 wherein each of said subscriber lines is provided with a shunt capacitance and a series inductance for resonant energy transfer between communicating subscriber lines during said recurrent time intervals.
Claim 8
Dependent Claim
41 words
A system as defined in claim 1 wherein said branch lines are each divided into a plurality of sections containing junctions with respective subscriber lines, said sections being provided with individual terminating impedances and circuit breakers controlled by said timer means.
Claim 9
Dependent Claim
40 words
A system as defined in claim 1 wherein said main line is divided into a plurality of sections containing junctions with respective branch lines, said sections being provided with individual terminating impedances and circuit breakers controlled by said timer 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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |