US2541932A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplex speech interpolation system
Assignee: AT&T Inc
•
Filing: 1948-05-19
•
Granted: 1951-02-13
•
Expires: 1968-05-19
Abstract
No abstract record available.
Inventors
- 👤 Alfred E Melhose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:19
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/06; H04; H04J; H04J3/00; H04J3/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2434989A
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US2395467A
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US2423466A
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US2388001A
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US2438908A
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US2464607A
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US2478409A
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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) | 1954-02-12 | 1954-08-14 | 1955-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-12 | 1958-08-14 | 1959-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-12 | 1962-08-14 | 1963-02-13 | $7700.00 | Window Closed / Lapsed |