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US3474333A
Expired / Lapsed
US
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Apparatus for determining distance-to-fault in electrical systems
Assignee: English Electric Co Ltd
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Filing: 1967-09-11
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Granted: 1969-10-21
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Expires: 1987-09-11
Abstract
No abstract record available.
Inventors
- 👤 Hans Hoel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:14
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40; G; G01; G01R; G01R31/00; G01R31/08; H02H3/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3281673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-20 | 1973-04-21 | 1973-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-20 | 1977-04-21 | 1977-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-20 | 1981-04-21 | 1981-10-21 | $7700.00 | Window Closed / Lapsed |