US2881266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High impedance input circuit amplifier
Assignee: AT&T Inc
•
Filing: 1953-06-26
•
Granted: 1959-04-07
•
Expires: 1973-06-26
Abstract
No abstract record available.
Inventors
- 👤 Ohmer R Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:48
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2743325A
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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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |