US2658951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound system
Assignee: RCA Corp
•
Filing: 1948-10-30
•
Granted: 1953-11-10
•
Expires: 1968-10-30
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Albee
- 👤 Hugh C Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:55
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1756864A
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US1965173A
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US2102895A
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US2213631A
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FR899195A
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US2416606A
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US2442400A
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US2468198A
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GB618349A
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US2536030A
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US2532761A
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US2530029A
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US2538981A
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US2558432A
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US2540406A
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US2479869A
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US2550916A
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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) | 1956-11-09 | 1957-05-11 | 1957-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-09 | 1961-05-11 | 1961-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-09 | 1965-05-11 | 1965-11-10 | $7700.00 | Window Closed / Lapsed |