US2921144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer support for sound recording or reproducing system
Assignee: International Business Machines Corp
•
Filing: 1956-02-06
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Granted: 1960-01-12
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Expires: 1976-02-06
Abstract
No abstract record available.
Inventors
- 👤 Harold F Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:00
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/32; G11B5/00; G11B5/48; G11B5/58; G11B5/60
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |