US2629017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speech transmission system
Assignee: AT&T Inc
•
Filing: 1949-05-20
•
Granted: 1953-02-17
•
Expires: 1969-05-20
Abstract
No abstract record available.
Inventors
- 👤 Carl A Dahlbom
- 👤 Weaver Allan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:18
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1918252A
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US2021743A
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US2232390A
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US2471333A
Cited
US2454815A
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US2486391A
Cited
US2471138A
Cited
US2443198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-17 | 1956-08-18 | 1957-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-17 | 1960-08-18 | 1961-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-17 | 1964-08-18 | 1965-02-17 | $7700.00 | Window Closed / Lapsed |