US3542954A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dereverberation by spectral measurement
Assignee: AT&T Inc
•
Filing: 1968-06-17
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Granted: 1970-11-24
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Expires: 1988-06-17
Abstract
No abstract record available.
Inventors
- 👤 James L Flanagan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:14
CPC Classifications
G; G01; G01H; G01H3/00; G10; G10K; G10K15/00; G10K15/08; G10K15/10; G10K2210/00; G10K2210/10; G10K2210/108; G10K2210/30; G10K2210/301; G10K2210/3028; G10K2210/50; G10K2210/505
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2817711A
Cited
US3155909A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |