Patent US2710313A successfully refreshed from Google Patents.
US2710313A
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US
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Electromagnetic audio amplifiers
Assignee: Vickers Inc
•
Filing: 1948-10-12
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Granted: 1955-06-07
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Expires: 1968-10-12
Abstract
No abstract record available.
Inventors
- 👤 Frank G Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:40
CPC Classifications
H; H03; H03F; H03F9/00; H03F9/04; Y; Y10; Y10S; Y10S292/00; Y10S292/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1847079A
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US2027311A
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US2164383A
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US2108642A
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US2338423A
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US2306998A
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US2504675A
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US2509864A
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US2509738A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-06 | 1958-12-06 | 1959-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-06 | 1962-12-06 | 1963-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-06 | 1966-12-06 | 1967-06-07 | $7700.00 | Window Closed / Lapsed |