US3230424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for the protection of a direct-current system with both poles insulated
Assignee: Charbonnages de France CDF
•
Filing: 1963-02-05
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Granted: 1966-01-18
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Expires: 1983-02-05
Abstract
No abstract record available.
Inventors
- 👤 Gagniere Claude
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:18
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A SYSTEM FOR ENSURING THE PROTECTION AND SUPERVISION OF THE INSULATION OF A DIRECT-CURRENT ELECTRICAL NETWORK, THE TWO POLES OF WHICH ARE INSULATED FROM EARTH, COMPRISING: SWITCHING MEANS FOR ALTERNATELY CONNECTED AT A FREQUENCY LESS THAN ONE SECOND, EACH OF THE TWO POLES OF THE NETWORKL TO EARTH; A DETECTION CIRCUIT CONNECTED BETWEEN SAID SWITCHING MEANS AND EARTH, TRANSMITTING THE CHARGE AND DISCHARGED CURRENTS OF THE LINE CAPACITIES OF THE NETWORK APPEARING DURING HE SWITCHING ON EACH POLE; MEANS FOR OBTAINING A VARIABLE RECTIFIED SIGNAL FROM SAID CHARGE AND DISCHARGE CURRENTS OF THE LINE CAPACITIES OF THE NETWORK; AND MEANS FOR TRANSFORMING THE VARIABLE CURRENT CIRCULATING IN SAID DETECTION CIRCUIT AT EACH SWITCHING OPERATION TO A SIGNAL WHICH CANCELS OUT THE VARIATIONS OF SAID RECTIFIED SIGNAL.
Claim 2
Independent Claim
126 words
A SYSTEM FOR ENSURING THE PROTECTION AND SUPERVISION OF THE INSULATION OF A DIRECT-CURRENT ELECTRICAL NETWORK, THE TWO POLES OF WHICH ARE INSULATED FROM EARTH, COMPRISING: SWITCHING MEANS FOR ALTERNATELY CONNECTED AT A FREQUENCY LESS THAN ONE SECOND, EACH OF THE TWO POLES OF THE NETWORKL TO EARTH; A DETECTION CIRCUIT CONNECTED BETWEEN SAID SWITCHING MEANS AND EARTH, TRANSMITTING THE CHARGE AND DISCHARGED CURRENTS OF THE LINE CAPACITIES OF THE NETWORK APPEARING DURING HE SWITCHING ON EACH POLE; MEANS FOR OBTAINING A VARIABLE RECTIFIED SIGNAL FROM SAID CHARGE AND DISCHARGE CURRENTS OF THE LINE CAPACITIES OF THE NETWORK; AND MEANS FOR TRANSFORMING THE VARIABLE CURRENT CIRCULATING IN SAID DETECTION CIRCUIT AT EACH SWITCHING OPERATION TO A SIGNAL WHICH CANCELS OUT THE VARIATIONS OF SAID RECTIFIED SIGNAL.
References Cited (Backward Citations)
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Cited
US2700125A
Cited
US3025414A
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Cited
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Cited
US3159825A
Cited
US3158785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |