US2722664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable inductance device
Assignee: AT&T Inc
•
Filing: 1951-12-18
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Granted: 1955-11-01
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Expires: 1971-12-18
Abstract
No abstract record available.
Inventors
- 👤 Robert S Duncan
- 👤 Jr Henry A Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:49
CPC Classifications
H; H01; H01F; H01F17/00; H01F17/04; H01F17/043
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) | 1958-10-31 | 1959-05-02 | 1959-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-31 | 1963-05-02 | 1963-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-31 | 1967-05-02 | 1967-11-01 | $7700.00 | Window Closed / Lapsed |