US2961492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastic multiplex speech interpolation system
Assignee: AT&T Inc
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Filing: 1957-09-26
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Granted: 1960-11-22
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Expires: 1977-09-26
Abstract
No abstract record available.
Inventors
- 👤 Robert L Carbrey
- 👤 Carl B H Feldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:32
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/16; H04J3/1682; H04J3/1688; H04J3/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |