Patent US3851219A successfully refreshed from Google Patents.
US3851219A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit-opening device for interrupting heavy currents by means of an explosive charge
Assignee: Individual
•
Filing: 1973-12-26
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Granted: 1974-11-26
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Expires: 1993-12-26
Abstract
Abstract A circuit-opening device comprising an explosive circuit-breaker which consists of a hollow conductor housing an explosive cartridge, an explosive charge and a detonator and also an operating current relay in the form of, say, a low-voltage spark gap, a trigatron or thyratron, the place where the electric circuit is opened being in the form of two parallel branches, one of which includes only an explosive circuit-breaker and serves continuously to carry the operating current while the other branch includes an explosive circuit-breaker and a seriesconnected operating current relay, which normally does not pass the operating current.
Inventors
- 👤 V Semchenko
- 👤 G Mikhailu
- 👤 K Kozorezov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:49
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/021; H01; H01H; H01H39/00; H01H39/006; H01H9/00; H01H9/54
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
116 words
A circuit-opening device for interrupting heavy currents by means of an explosive charge, wherein the place where a circuit is opened is in the form of two parallel branches, the first of which includes only an explosive circuit-breaker while the second branch includes a series-combination of an explosive circuitbreaker and an operating current relay, so that initially no current flows through the relay and, when the circuit is being opened, the first branch is interrupted first, the current is transferred to the second branch and then the second branch is interrupted after a time delay sufficiently long to allow the circuit-breaker of the first branch to form a gap capable of withstanding all subsequent circuit voltages.
Claim 2
Dependent Claim
116 words
A circuit-opening device for interrupting heavy currents by means of an explosive charge, wherein the place where a circuit is opened is in the form of two parallel branches, the first of which includes only an explosive circuit-breaker while the second branch includes a series-combination of an explosive circuitbreaker and an operating current relay, so that initially no current flows through the relay and, when the circuit is being opened, the first branch is interrupted first, the current is transferred to the second branch and then the second branch is interrupted after a time delay sufficiently long to allow the circuit-breaker of the first branch to form a gap capable of withstanding all subsequent circuit voltages.
Claim 3
Dependent Claim
36 words
A circuit-opening device as claimed in claim 1, wherein an operating current relay is made in the form of a low-voltage spark gap selected such that the gap breaks down when the first branch is interrupted.
References Cited (Backward Citations)
US2305436A
Cited
US2653203A
Cited
US2892062A
Cited
US3155797A
Cited
US3296518A
Cited
US3400301A
Cited
US3544843A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |