US2643071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducing apparatus
Assignee: Brush Development Co
•
Filing: 1947-03-07
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Granted: 1953-06-23
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Expires: 1967-03-07
Abstract
No abstract record available.
Inventors
- 👤 Alfred L W Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:18
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/66; G11B15/02; G11B15/10; G11B15/16; G11B15/18; G11B15/26; G11B15/28; G11B15/29; G11B15/43; G11B15/44; G11B15/442
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US947148A
Cited
US1108501A
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US1366182A
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US1560721A
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US1642681A
Cited
US1814706A
Cited
FR852767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |