Patent GB355705A successfully refreshed from Google Patents.
US2662124A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier circuit
Assignee: AT&T Inc
•
Filing: 1949-06-01
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Granted: 1953-12-08
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Expires: 1969-06-01
Abstract
No abstract record available.
Inventors
- 👤 Mcmillan Brockway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:40
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H03F1/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2524035A
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US2486776A
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US2517960A
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US2476323A
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US2585078A
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US2533001A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-07 | 1957-06-08 | 1957-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-07 | 1961-06-08 | 1961-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-07 | 1965-06-08 | 1965-12-08 | $7700.00 | Window Closed / Lapsed |