US2585077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of impedance of semiconductor amplifier circuits
Assignee: AT&T Inc
•
Filing: 1948-11-06
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Granted: 1952-02-12
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Expires: 1968-11-06
Abstract
No abstract record available.
Inventors
- 👤 Harold L Barney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:48
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1206; H03B5/1221; H03B5/1231; H03F1/00; H03F1/34; H03F1/56; H10; H10D; H10D99/00
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) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |