US2906971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsional vibrational wave filters and delay lines
Assignee: AT&T Inc
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Filing: 1956-02-10
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Granted: 1959-09-29
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Expires: 1976-02-10
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
- 👤 Robert N Thurston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:18
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/30; H03H9/36
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) | 1962-09-28 | 1963-03-30 | 1963-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-28 | 1967-03-30 | 1967-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-28 | 1971-03-30 | 1971-09-29 | $7700.00 | Window Closed / Lapsed |