Patent US3408564A successfully refreshed from Google Patents.
US3408564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical apparatus including a pair of replica impedances for measuring distances along a loaded electrical line
Assignee: English Electric Co Ltd
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Filing: 1965-02-01
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Granted: 1968-10-29
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Expires: 1985-02-01
Abstract
No abstract record available.
Inventors
- 👤 Hoel Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:43
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/38; H02H3/382; G; G01; G01R; G01R31/00; G01R31/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
APPARATUS FOR MEASURING FROM A REFERENCE DATUM THE DISTANCE TO A LOAD POINT ALONG AN ELECTRICAL LINE HAVING A PREDETERMINED LOAD LOCUS ON AN R-X OPERATING CHARACTERISTIC OF SAID APPARATUS, COMPRISING A PAIR OF REPLICA IMPEDANCES DEFINING PREDETERMINED IMPEDANCE VECTORS INTERSECTING THE SAID DATUM ON THE CHARACTERISTIC, MEANS FOR MONITORING THE CURRENT AND VOLTAGE OF THE LINE AND APPLYING ONE OF THESE QUANTITIES TO SAID REPLICA IMPEDANCES, MEANS FOR DERIVING FROM THE MONITORED QUANTITIES TWO
Claim 2
Dependent Claim
75 words
APPARATUS FOR MEASURING FROM A REFERENCE DATUM THE DISTANCE TO A LOAD POINT ALONG AN ELECTRICAL LINE HAVING A PREDETERMINED LOAD LOCUS ON AN R-X OPERATING CHARACTERISTIC OF SAID APPARATUS, COMPRISING A PAIR OF REPLICA IMPEDANCES DEFINING PREDETERMINED IMPEDANCE VECTORS INTERSECTING THE SAID DATUM ON THE CHARACTERISTIC, MEANS FOR MONITORING THE CURRENT AND VOLTAGE OF THE LINE AND APPLYING ONE OF THESE QUANTITIES TO SAID REPLICA IMPEDANCES, MEANS FOR DERIVING FROM THE MONITORED QUANTITIES TWO
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-29 | 1972-04-29 | 1972-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-29 | 1976-04-29 | 1976-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-29 | 1980-04-29 | 1980-10-29 | $7700.00 | Window Closed / Lapsed |