US3025412A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier circuits
Assignee: AT&T Inc
•
Filing: 1954-06-17
•
Granted: 1962-03-13
•
Expires: 1974-06-17
Abstract
No abstract record available.
Inventors
- 👤 Jean H Felker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:09
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03K3/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2390502A
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US2419052A
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US2556286A
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US2706247A
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US2627039A
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US2756329A
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US2757243A
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US2758205A
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US2673936A
Cited
US2644893A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-12 | 1965-09-11 | 1966-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-12 | 1969-09-11 | 1970-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-12 | 1973-09-11 | 1974-03-13 | $7700.00 | Window Closed / Lapsed |