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US3517306A
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Signal reflection type fault location system utilizing a low frequency test signal with test signal cancellation in signal display apparatus
Assignee: AT&T Inc
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Filing: 1968-06-25
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Granted: 1970-06-23
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Expires: 1988-06-25
Abstract
No abstract record available.
Inventors
- 👤 Theodore C Anderson
- 👤 James F Ingle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:27
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/08; G01R31/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1395854A
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US2476317A
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US2490377A
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US2611805A
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US2493800A
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US2800627A
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US3031643A
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US3244978A
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US3281674A
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US3255406A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-22 | 1973-12-22 | 1974-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-22 | 1977-12-22 | 1978-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-22 | 1981-12-22 | 1982-06-23 | $7700.00 | Window Closed / Lapsed |