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Patent US2808463A successfully refreshed from Google Patents.
US2808463A
Expired / Lapsed
US
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Telephone signaling device
Assignee: AT&T Inc
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Filing: 1956-06-07
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Granted: 1957-10-01
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Expires: 1976-06-07
Abstract
No abstract record available.
Inventors
- 👤 Reginald T Jenkins
- 👤 Robert E Polk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:02
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02; G10K11/025; G10K1/00; G10K1/06; G10K1/062; G10K9/00; G10K9/12; G10K9/13; H; H04; H04M; H04M1/00; H04M1/02; H04M19/00; H04M19/02; H04M19/04; H04Q; H04Q5/00; H04Q5/02; H04Q5/08; H04R; H04R11/00; H04R11/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |