Patent US2509012A successfully refreshed from Google Patents.
US2509012A
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US
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Magnetic disk record
Assignee: Individual
•
Filing: 1945-10-18
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Granted: 1950-05-23
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Expires: 1965-10-18
Abstract
No abstract record available.
Inventors
- 👤 Morrison Montford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/004; Y; Y10; Y10S; Y10S264/00; Y10S264/58; Y10S29/00; Y10S29/028; Y10T; Y10T29/00; Y10T29/49; Y10T29/4957; Y10T29/49577
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) | 1953-05-22 | 1953-11-21 | 1954-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-05-22 | 1957-11-21 | 1958-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-05-22 | 1961-11-21 | 1962-05-23 | $7700.00 | Window Closed / Lapsed |