US3581008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse-transmission system
Assignee: SOC ITALIANA TELECOMUNICAZIONI SLEMENS SpA
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Filing: 1968-09-26
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Granted: 1971-05-25
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Expires: 1988-09-26
Abstract
Abstract Telecommunication system in which counting pulses or other short input signals are transmitted over a line by respective reversals of polarity which, at the receiving end, are detected and translated into a train of output pulses at a cadence corresponding to that of the train of input pulses giving rise to the polarity reversals.
Inventors
- 👤 Giorgio Dal Monte
- 👤 Nicola Pitidis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:49
CPC Classifications
H; H04; H04M; H04M15/00; H04M15/28; H04Q; H04Q1/00; H04Q1/18; H04Q1/30; H04Q1/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
In a communication system provided with a transmission line capable of transmitting D.C. signals from a first station to a second station, the combination therewith of: a source of positive voltage and a source of negative voltage at said first station; switchover means at said first station for alternately connecting said sources to a conductor of said line; a generator of input pulses at said first station connected to operate said switchover means once per input pulse whereby each input pulse gives rise to a polarity reversal on said conductor; detector means at said second station connected to said line and responsive to polarity reversals on said conductor; and circuit means connected to said detector means at said second station for converting each polarity reversal on said conductor into a respective output pulse.
Claim 2
Dependent Claim
133 words
In a communication system provided with a transmission line capable of transmitting D.C. signals from a first station to a second station, the combination therewith of: a source of positive voltage and a source of negative voltage at said first station; switchover means at said first station for alternately connecting said sources to a conductor of said line; a generator of input pulses at said first station connected to operate said switchover means once per input pulse whereby each input pulse gives rise to a polarity reversal on said conductor; detector means at said second station connected to said line and responsive to polarity reversals on said conductor; and circuit means connected to said detector means at said second station for converting each polarity reversal on said conductor into a respective output pulse.
Claim 3
Dependent Claim
25 words
The combination defined in claim 1 wherein said detector means comprises amplifier means provided with an input circuit including capacitive means connected to said conductor.
Claim 4
Dependent Claim
27 words
The combination defined in claim 2 wherein said input circuit includes a rectification network with two parallel branches and oppositely poled diodes respectively connected in said branches.
Claim 5
Dependent Claim
25 words
The combination defined in claim 3 wherein said capacitive means includes a pair of condensers respectively connected in said branches in series with said diodes.
Claim 6
Dependent Claim
54 words
The combination defined in claim 4 wherein said network is provided with a rectifying shunt arm connected between respective junctions of said condensers and said diodes, said amplifier means comprising a transistor with a base and an emitter respectively connected to said branches for energization from said conductor via said diodes and condensers thereof.
Claim 7
Dependent Claim
47 words
The combination defined in claim 5 wherein said shunt arm includes a half-wave rectifier, a Zener diode in series with said rectifier and an equalizing resistor in parallel with said Zener diode, said resistor being of large magnitude compared with the breakdown resistance of said Zener diode.
Claim 8
Dependent Claim
23 words
The combination defined in claim 4 wherein said network includes two further diodes respectively connected across said condensers for preventing charge inversions thereon.
Claim 9
Dependent Claim
24 words
The combination defined in claim 4 wherein said amplifier means comprises a pair of transistors of opposite conductivity types respectively connected across said condensers.
Claim 10
Dependent Claim
53 words
The combination defined in claim 2 wherein Said amplifier means is connected for substantial saturation and cutoff, respectively, by potentials of opposite polarities on said capacitive means, said circuit means including a differentiation circuit responsive to leading and trailing edges of square waves generated by said amplifier means upon alternate saturation and cutoff.
Claim 11
Dependent Claim
18 words
The combination defined in claim 2 wherein said amplifier means comprises two transistor stages of opposite conductivity types.
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |