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Patent US4721538A successfully refreshed from Google Patents.
US4721538A
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US
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Permanent magnet alloy
Assignee: Crucible Materials Corp
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Filing: 1986-06-20
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Granted: 1988-01-26
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Expires: 2006-06-20
Abstract
Abstract A rare-earth element permanent magnet alloy characterized by good magnetic alignment and high energy product, said magnet consisting essentially of, in atomic percent, at least one rare earth element didymium, mischmetal, neodymium and thorium 12 to 20, boron 4 to 14 and balance iron.
Inventors
- 👤 Kalathur S. V. L. Narasimhan
- 👤 Bao-Min Ma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:10
CPC Classifications
C; C22; C22C; C22C38/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
21 words
A permanent magnet alloy consisting essentially of, in atomic percent, mischmetal 12 to 20, boron 4 to 14 and balance iron.
Claim 2
Dependent Claim
21 words
A permanent magnet alloy consisting essentially of, in atomic percent, mischmetal 12 to 20, boron 4 to 14 and balance iron.
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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |