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US2531642A
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US
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Magnetic transducing system
Assignee: AT&T Inc
•
Filing: 1947-10-30
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Granted: 1950-11-28
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Expires: 1967-10-30
Abstract
No abstract record available.
Inventors
- 👤 Ralph K Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/027
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2195192A
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DE693956C
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US2351003A
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US2327956A
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US2344615A
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US2354176A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-11-27 | 1954-05-29 | 1954-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-11-27 | 1958-05-29 | 1958-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-11-27 | 1962-05-29 | 1962-11-28 | $7700.00 | Window Closed / Lapsed |