US2670445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Regenerative transistor amplifier
Assignee: AT&T Inc
•
Filing: 1951-11-06
•
Granted: 1954-02-23
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Expires: 1971-11-06
Abstract
No abstract record available.
Inventors
- 👤 Jean H Felker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 02:22
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/08; H03K19/082; H03K19/084; H03K3/00; H03K3/02; H03K3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2531076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |