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Patent US2861258A successfully refreshed from Google Patents.
US2861258A
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Transistor amplifier circuit
Assignee: International Business Machines Corp
•
Filing: 1954-09-30
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Granted: 1958-11-18
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Expires: 1974-09-30
Abstract
No abstract record available.
Inventors
- 👤 James L Walsh
- 👤 Joseph C Logue
- 👤 Robert L Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:31
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/26; H03F; H03F1/00; H03F1/56
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2659773A
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US2620448A
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US2633564A
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US2750452A
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US2723080A
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US2622213A
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US2774826A
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US2762873A
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US2760007A
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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) | 1961-11-17 | 1962-05-19 | 1962-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-17 | 1966-05-19 | 1966-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-17 | 1970-05-19 | 1970-11-18 | $7700.00 | Window Closed / Lapsed |