US2553768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet material and method of preparing the same
Assignee: Indiana Steel Products Co
•
Filing: 1947-02-28
•
Granted: 1951-05-22
•
Expires: 1967-02-28
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:42
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1669642A
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US1976230A
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US1946964A
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US2196824A
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US2254976A
Cited
US2273832A
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US2402694A
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US2463413A
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US2427018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-21 | 1954-11-20 | 1955-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-21 | 1958-11-20 | 1959-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-21 | 1962-11-20 | 1963-05-22 | $7700.00 | Window Closed / Lapsed |