US2659775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier circuit having seriesconnected tubes
Assignee: Individual
•
Filing: 1949-03-21
•
Granted: 1953-11-17
•
Expires: 1969-03-21
Abstract
No abstract record available.
Inventors
- 👤 Wallace H Coulter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:37
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/42; H03F3/44; B; B07; B07B; B07B13/00; B07B13/04; B07B13/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1654075A
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US1985923A
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US2158659A
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US2153756A
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US2358428A
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US2510683A
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US2431973A
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US2488567A
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US2525632A
Cited
US2594436A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-16 | 1957-05-18 | 1957-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-16 | 1961-05-18 | 1961-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-16 | 1965-05-18 | 1965-11-17 | $7700.00 | Window Closed / Lapsed |