US2820855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High impedance transistor amplifier
Assignee: General Precision Laboratory Inc
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Filing: 1955-07-07
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Granted: 1958-01-21
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Expires: 1975-07-07
Abstract
No abstract record available.
Inventors
- 👤 Sherr Solomon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:42
CPC Classifications
H; H03; H03F; H03F5/00; H03F1/00; H03F1/30; H03F1/302
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) | 1961-01-20 | 1961-07-22 | 1962-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-20 | 1965-07-22 | 1966-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-20 | 1969-07-22 | 1970-01-21 | $7700.00 | Window Closed / Lapsed |