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US2499759A
Expired / Lapsed
US
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Location of faults in electrical transmission systems
Assignee: AT&T Inc
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Filing: 1947-07-31
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Granted: 1950-03-07
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Expires: 1967-07-31
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Kempf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:14
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE306679C
Cited
US1745419A
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US1886682A
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US2176757A
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US2199846A
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US2321424A
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US2460688A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |