US2775650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferroelectric recording and reproduction of speech
Assignee: AT&T Inc
•
Filing: 1954-12-31
•
Granted: 1956-12-25
•
Expires: 1974-12-31
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
- 👤 Robert N Thurston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:59
CPC Classifications
G; G11; G11B; G11B9/00; G11B9/02; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/48; C04B35/50; C04B35/51
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2200741A
Cited
US2698928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |