Patent US2561338A successfully refreshed from Google Patents.
US2561338A
Expired / Lapsed
US
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Binaural magnetic recorder
Assignee: IIT Research Institute
•
Filing: 1946-12-31
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Granted: 1951-07-24
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Expires: 1966-12-31
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/78; H04N5/782; G; G11; G11B; G11B5/00; G11B5/127; G11B5/29; G11B5/40; H04R; H04R5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1971028A
Cited
GB316654A
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DE701552C
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US2167188A
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US2144844A
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US2089287A
Cited
US2229326A
Cited
US2335277A
Cited
FR884881A
Cited
US2361752A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |