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US3470331A
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Fault-generated surge responsive fault locating system for frequency division multiplexed transmission facilities
Assignee: AT&T Inc
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Filing: 1966-12-29
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Granted: 1969-09-30
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Expires: 1986-12-29
Abstract
No abstract record available.
Inventors
- 👤 Meyer Barash
- 👤 Per Brostrup-Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:39
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2315450A
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US2315383A
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US2522362A
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US2628267A
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US2725526A
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US2717992A
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US2794071A
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US3281673A
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US3408564A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-29 | 1973-03-31 | 1973-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-29 | 1977-03-31 | 1977-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-29 | 1981-03-31 | 1981-09-30 | $7700.00 | Window Closed / Lapsed |