US2501126A
Expired / Lapsed
US
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Magnetic record medium
Assignee: Indiana Steel Products Co
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Filing: 1946-10-18
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Granted: 1950-03-21
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Expires: 1966-10-18
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:35
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/74; B; B82; B82Y; B82Y10/00; G11B5/743; G11B5/82; Y; Y10; Y10S; Y10S29/00; Y10S29/028; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9265; Y10S428/928; Y10T; Y10T29/00; Y10T29/49; Y10T29/4957; Y10T29/49577; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12069; Y10T428/12076; Y10T428/12083; Y10T428/12389; Y10T428/12493; Y10T428/12771; Y10T428/12785; Y10T428/12792; Y10T428/12799; Y10T428/12986
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) | 1953-03-20 | 1953-09-19 | 1954-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-20 | 1957-09-19 | 1958-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-20 | 1961-09-19 | 1962-03-21 | $7700.00 | Window Closed / Lapsed |