US4008377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for registering and reading of message units in telephone exchanges
Assignee: Warsaw University of Technology
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Filing: 1975-09-05
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Granted: 1977-02-15
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Expires: 1995-09-05
Abstract
Abstract An arrangement for registering and reading message units for calls in a telephone or Telex exchange to allow automatic billing for calls and presenting the bills to the subscribers of the exchanges. Electrochemical integrators are connected so that one of their electrodes is connected to ground potential, whereas the other electrodes of these integrators are connected over resistors to wires conducting metering pulses to individual equipments of exchange lines. The latter electrodes during the reading process become connected over a commutator to a reading device having threshold means detecting the increase of voltage on terminals of the integrator. A generator provides square pulses having their polarization opposite to that of the metering pulses. The output of the generator is connected to a gate having its other input connected to the threshold means. The output of the gate is connected to the input of the pulse counter. The output of the pulse counter and the output of the commutator are connected with a device for registering the read pulses and commutator position.
Inventors
- 👤 Jerzy W. Szczepanski
- 👤 Wieslaw Wilczynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:35
CPC Classifications
H; H04; H04M; H04M15/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
230 words
An arrangement for registering and reading message units in telephone or Telex exchanges comprising, in combination, electrochemical integrators, each having a first electrode connected to ground potential and having a second electrode, sources connected to corresponding integrators and supplying metering pulses to said integrators, a resistor connected between each source and the second electrode of the corresponding electrochemical integrator, a reading system for reading the outputs of said integrators, a commutator with a plurality of positions connecting selectively the second electrode of an integrator with said reading system, said reading system comprising a threshold device detecting an increase of voltage across the terminals of an integrator which is connected to said reading system, said threshold device having an output, and a generator generating standard square-wave pulses having their polarization opposite to that of the metering pulses, an AND gate having a first input connected to said generator and having a second input connected to the output of said threshold device, a pulse counter connected to the output of said AND gate for counting gated pulses from said generator, said pulse counter having an output, means for controlling the commutator and having an output for indicating the commutator position, and means connected to the output of said pulse counter and the output of said controlling means for registering pulses read out from said integrators and for registering the respective commutator position.
Claim 2
Dependent Claim
230 words
An arrangement for registering and reading message units in telephone or Telex exchanges comprising, in combination, electrochemical integrators, each having a first electrode connected to ground potential and having a second electrode, sources connected to corresponding integrators and supplying metering pulses to said integrators, a resistor connected between each source and the second electrode of the corresponding electrochemical integrator, a reading system for reading the outputs of said integrators, a commutator with a plurality of positions connecting selectively the second electrode of an integrator with said reading system, said reading system comprising a threshold device detecting an increase of voltage across the terminals of an integrator which is connected to said reading system, said threshold device having an output, and a generator generating standard square-wave pulses having their polarization opposite to that of the metering pulses, an AND gate having a first input connected to said generator and having a second input connected to the output of said threshold device, a pulse counter connected to the output of said AND gate for counting gated pulses from said generator, said pulse counter having an output, means for controlling the commutator and having an output for indicating the commutator position, and means connected to the output of said pulse counter and the output of said controlling means for registering pulses read out from said integrators and for registering the respective commutator position.
Claim 3
Dependent Claim
20 words
The arrangement as defined in claim 1, wherein said integrators are each connected one after another to said reading system.
Claim 4
Dependent Claim
22 words
The arrangement as defined in claim 2, wherein said integrators are each connected to said reading system in a freely determined sequence.
Claim 5
Dependent Claim
47 words
The arrangement as defined in claim 2, including a capacitor connected in series with each of said resistors, and a diode with cathode connected to the junction between each of said capacitors and the corresponding resistor, each of said diodes having an anode connected to ground potential.
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) | 1980-02-15 | 1980-08-16 | 1981-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-15 | 1984-08-16 | 1985-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-15 | 1988-08-16 | 1989-02-15 | $7700.00 | Window Closed / Lapsed |