US3381175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit-breaker arrangements
Assignee: English Electric Co Ltd
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Filing: 1964-09-08
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Granted: 1968-04-30
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Expires: 1984-09-08
Abstract
No abstract record available.
Inventors
- 👤 Brown Jack Keyes
- 👤 Hughes Vincent Alfred
- 👤 Burnett Thomas Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:19
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/021; H01; H01H; H01H33/00; H01H33/002; H01H33/004; H02H9/00; H02H9/02; H02H9/023; H03; H03K; H03K3/00; H03K3/02; H03K3/38; H10; H10N; H10N60/00; H10N60/30; H10N60/35; H10N60/355; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/856; Y10S505/857; Y10S505/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
IN OR FOR AN ALTERNATING CURRENT ELECTRIC CIRCUIT, A CIRCUIT-BREAKER ARRANGEMENT INCLUDING A NORMALLY-CLOSED CIRCUIT-BREAKER, A SUPERCONDUCTING SWITCH, A NORMALLYOPEN CIRCUIT-BREAKER IN SERIES WITH SAID SUPERCONDUCTING SWITCH, SAID SUPERCONDUCTING SWITCH AND SAID NORMALLYOPEN CIRCUIT-BREAKER BEING IN PARALLEL WITH SAID NORMALLYCLOSED CIRCUIT-BREAKER, AND A SERIES CIRCUIT-BREAKER WHICH IS IN SERIES AT LEAST WITH THE SUPERCONDUCTING SWITCH AND THE NORMALLY-OPEN CIRCUIT-BREAKER.
Claim 2
Dependent Claim
59 words
IN OR FOR AN ALTERNATING CURRENT ELECTRIC CIRCUIT, A CIRCUIT-BREAKER ARRANGEMENT INCLUDING A NORMALLY-CLOSED CIRCUIT-BREAKER, A SUPERCONDUCTING SWITCH, A NORMALLYOPEN CIRCUIT-BREAKER IN SERIES WITH SAID SUPERCONDUCTING SWITCH, SAID SUPERCONDUCTING SWITCH AND SAID NORMALLYOPEN CIRCUIT-BREAKER BEING IN PARALLEL WITH SAID NORMALLYCLOSED CIRCUIT-BREAKER, AND A SERIES CIRCUIT-BREAKER WHICH IS IN SERIES AT LEAST WITH THE SUPERCONDUCTING SWITCH AND THE NORMALLY-OPEN CIRCUIT-BREAKER.
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) | 1971-04-30 | 1971-10-30 | 1972-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-30 | 1975-10-30 | 1976-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-30 | 1979-10-30 | 1980-04-30 | $7700.00 | Window Closed / Lapsed |