Patent US1490157A successfully refreshed from Google Patents.
Patent US3353031A successfully refreshed from Google Patents.
US3353031A
Expired / Lapsed
US
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Low noise level short wave amplification employing a reactance modulator
Assignee: Siemens and Halske AG
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Filing: 1960-06-03
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Granted: 1967-11-14
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Expires: 1980-06-03
Abstract
No abstract record available.
Inventors
- 👤 Abel Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:04
CPC Classifications
H; H03; H03C; H03C7/00; H03C7/02; H03F; H03F7/00; H03F7/04; H03F2200/00; H03F2200/372
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) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |