US2709597A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic sound recording apparatus
Assignee: Umicore NV SA
•
Filing: 1951-06-20
•
Granted: 1955-05-31
•
Expires: 1971-06-20
Abstract
No abstract record available.
Inventors
- 👤 Pierre Stroobants
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:07
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; G11B5/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US912724A
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US857974A
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US1159941A
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US2085093A
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FR783581A
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US2172431A
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US2216608A
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US2372774A
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US2512940A
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US2431360A
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US2530029A
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FR970077A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-30 | 1958-11-29 | 1959-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-30 | 1962-11-29 | 1963-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-30 | 1966-11-29 | 1967-05-31 | $7700.00 | Window Closed / Lapsed |