Patent US2699467A successfully refreshed from Google Patents.
US2699467A
Expired / Lapsed
US
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Telephone system and a relayless line circuit and circuits in cooperation therewith for extending a call
Assignee: Automatic Electric Laboratories Inc
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Filing: 1951-03-16
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Granted: 1955-01-11
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Expires: 1971-03-16
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Faulkner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:39
CPC Classifications
H; H04; H04Q; H04Q3/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB409670A
Cited
US2152889A
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US2242776A
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US2295032A
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US2502415A
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US2389666A
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US2409586A
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US2574224A
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US2598822A
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US2543534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |