Patent US3411087A successfully refreshed from Google Patents.
US3411087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring direct current impulses
Assignee: BBC Brown Boveri AG Germany
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Filing: 1965-06-11
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Granted: 1968-11-12
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Expires: 1985-06-11
Abstract
No abstract record available.
Inventors
- 👤 Vogel Xaver
- 👤 Knapp Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:49
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/18; G01R19/20; G01R1/00; G01R1/28; G01R19/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
APPARATUS FOR MEASURING DIRECT CURRENT IMPULSES COMPRISING A CURRENT TRANSFORMER INCLUDING FIRST AND SECOND SECONDARY WINDINGS ADAPTED TO BE BROUGHT INTO CONDUCTIVE RELATIONSHIP WITH THE LINE CONDUCTOR CARRYING THE DIRECT CURRENT IMPULSES DESIRED TO BE MEASURED, A CONTROLLABLE AMPLIFIER AND A CURRENT MEASURING DEVICE CONNECTED IN SERIES IN A MEASURING CIRCUIT CONNECTED TO SAID FIRST SECONDARY WINDING, SAID AMPLIFIER SERVING TO COMPENSATE FOR VOLTAGE DROPS IN SAID MEASURING CIRCUIT AND BEING BLOCKED IN THE ABSENCE OF CURRENT FLOW IN SAID LINE CONDUCTOR, AND CONTROL CIRCUIT MEANS CONNECTING SAID SECOND SECONDARY WINDING WITH THE CONTROL MEANS PROVIDED ON SAID AMPLIFIER FOR UNBLOCKING THE SAME TO ESTABLISH CURRENT FLOW TO SAID MEASURING DEVICE BUT ONLY WHEN CURRENT FLOWS IN SAID LINE CONDUCTOR.
Claim 2
Dependent Claim
120 words
APPARATUS FOR MEASURING DIRECT CURRENT IMPULSES COMPRISING A CURRENT TRANSFORMER INCLUDING FIRST AND SECOND SECONDARY WINDINGS ADAPTED TO BE BROUGHT INTO CONDUCTIVE RELATIONSHIP WITH THE LINE CONDUCTOR CARRYING THE DIRECT CURRENT IMPULSES DESIRED TO BE MEASURED, A CONTROLLABLE AMPLIFIER AND A CURRENT MEASURING DEVICE CONNECTED IN SERIES IN A MEASURING CIRCUIT CONNECTED TO SAID FIRST SECONDARY WINDING, SAID AMPLIFIER SERVING TO COMPENSATE FOR VOLTAGE DROPS IN SAID MEASURING CIRCUIT AND BEING BLOCKED IN THE ABSENCE OF CURRENT FLOW IN SAID LINE CONDUCTOR, AND CONTROL CIRCUIT MEANS CONNECTING SAID SECOND SECONDARY WINDING WITH THE CONTROL MEANS PROVIDED ON SAID AMPLIFIER FOR UNBLOCKING THE SAME TO ESTABLISH CURRENT FLOW TO SAID MEASURING DEVICE BUT ONLY WHEN CURRENT FLOWS IN SAID LINE CONDUCTOR.
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) | 1971-11-12 | 1972-05-13 | 1972-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-11-12 | 1976-05-13 | 1976-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-11-12 | 1980-05-13 | 1980-11-12 | $7700.00 | Window Closed / Lapsed |