US2498423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for demagnetizing high coercive force materials
Assignee: Indiana Steel Products Co
•
Filing: 1947-04-17
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Granted: 1950-02-21
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Expires: 1967-04-17
Abstract
No abstract record available.
Inventors
- 👤 Hugh A Howell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:22
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/027; G11B5/03
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1303398A
Cited
US1303397A
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US2281862A
Cited
US1414170A
Cited
US2216600A
Cited
US2305659A
Cited
US2418542A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |