US2632816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic recording and reproducing head
Assignee: Stromberg Carlson Corp
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Filing: 1951-03-26
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Granted: 1953-03-24
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Expires: 1971-03-26
Abstract
No abstract record available.
Inventors
- 👤 Joseph W Gratian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/127; G11B5/187; G11B5/23; G11B5/235
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB429987A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-23 | 1956-09-22 | 1957-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-23 | 1960-09-22 | 1961-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-23 | 1964-09-22 | 1965-03-24 | $7700.00 | Window Closed / Lapsed |