Patent US2947033A successfully refreshed from Google Patents.
US3662369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for signalling the operation of a circuit protecting device
Assignee: Bull HN Information Systems Italia SpA
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Filing: 1970-02-05
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Granted: 1972-05-09
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Expires: 1990-02-05
Abstract
Abstract A circuit for indicating the operative state of a circuit breaker which protects a load from an alternating voltage source, wherein a lamp is coupled to said source to light when the breaker is open, but is prevented from lighting when the breaker is closed by a forward biased diode which limits the voltage across the lamp.
Inventors
- 👤 Mario Vinsani
- 👤 Celio Trinca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:37
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/04; H02H3/046
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
For use with an electrical circuit wherein a source of alternating voltage provides current through a feeding line to a load, and wherein a protecting circuit breaking device is adapted to break the continuity of said feeding line, a circuit for signalling the operation of said circuit breaking device comprising: signalling means, a first diode, connected in a series circuit with said signalling means, a resistor connected in series with a first terminal of said series circuit, said series circuit being connected to a second terminal to a point on said feeding line immediately upstream of said circuit breaking device, a reference voltage coupled to said resistor, and a second diode connected between a point on said feeding line immediately downstream of said circuit breaking device and said first terminal, said first and second diodes have the same directions of conduction relative to said feeding line.
Claim 2
Dependent Claim
146 words
For use with an electrical circuit wherein a source of alternating voltage provides current through a feeding line to a load, and wherein a protecting circuit breaking device is adapted to break the continuity of said feeding line, a circuit for signalling the operation of said circuit breaking device comprising: signalling means, a first diode, connected in a series circuit with said signalling means, a resistor connected in series with a first terminal of said series circuit, said series circuit being connected to a second terminal to a point on said feeding line immediately upstream of said circuit breaking device, a reference voltage coupled to said resistor, and a second diode connected between a point on said feeding line immediately downstream of said circuit breaking device and said first terminal, said first and second diodes have the same directions of conduction relative to said feeding line.
Claim 3
Dependent Claim
150 words
For use with a circuit wherein a two-terminal circuit breaking device transmits current from a first circuit point having a first alternating voltage value to a load, a first terminal of said device being connected to said first circuit point and a second terminal of said device being connected to said load, an indicating circuit for representing the state of said circuit breaking device comprising: an indicating member, a first nonlinear device connected in a series circuit with said indicating member, said series circuit being connected to said first circuit point, a second circuit point having a second voltage value, a resistor connected between said second circuit point and said series circuit, and a second nonlinear device connected between said resistor and said second terminal, said first and said second nonlinear devices connected to be conducting in a path from said first and second terminals to said second circuit point.
Claim 4
Dependent Claim
150 words
For use with a circuit wherein a two-terminal circuit breaking device transmits current from a first circuit point having a first alternating voltage value to a load, a first terminal of said device being connected to said first circuit point and a second terminal of said device being connected to said load, an indicating circuit for representing the state of said circuit breaking device comprising: an indicating member, a first nonlinear device connected in a series circuit with said indicating member, said series circuit being connected to said first circuit point, a second circuit point having a second voltage value, a resistor connected between said second circuit point and said series circuit, and a second nonlinear device connected between said resistor and said second terminal, said first and said second nonlinear devices connected to be conducting in a path from said first and second terminals to said second circuit point.
References Cited (Backward Citations)
US3423745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |