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US2920149A
Expired / Lapsed
US
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Magnetic record transducing heads
Assignee: Sonotone Corp
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Filing: 1957-11-21
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Granted: 1960-01-05
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Expires: 1977-11-21
Abstract
No abstract record available.
Inventors
- 👤 Heiman W Koren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:37
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/10; G11B5/105; G11B5/11; G11B5/127; G11B5/17
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |