Patent US2489520A successfully refreshed from Google Patents.
US2489520A
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US
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Method of making magnetic impulse record members
Assignee: IIT Research Institute
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Filing: 1947-08-07
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Granted: 1949-11-29
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Expires: 1967-08-07
Abstract
No abstract record available.
Inventors
- 👤 Camras Marvin
- 👤 Hyrum E Flanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:29
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/64; G11B5/642; Y; Y10; Y10S; Y10S29/00; Y10S29/028
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) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |