US2654809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound apparatus
Assignee: IIT Research Institute
•
Filing: 1947-08-30
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Granted: 1953-10-06
•
Expires: 1967-08-30
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:26
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/26; G11B15/34; G11B5/00; G11B5/004; G11B5/127; G11B5/29
Claims Analysis
Total Claims: 0
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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) | 1956-10-05 | 1957-04-06 | 1957-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-10-05 | 1961-04-06 | 1961-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-10-05 | 1965-04-06 | 1965-10-06 | $7700.00 | Window Closed / Lapsed |