US3013123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic playback system
Assignee: IIT Research Institute
•
Filing: 1954-03-15
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Granted: 1961-12-12
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Expires: 1974-03-15
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:58
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1949409A
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US2272821A
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US2536029A
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US2539400A
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US2643130A
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US2547464A
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AT174220B
Cited
US2803708A
Cited
US2832839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |