Patent US4588439A successfully refreshed from Google Patents.
US4588439A
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US
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Oxygen containing permanent magnet alloy
Assignee: Vacuumschmelze GmbH and Co KG
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Filing: 1985-05-20
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Granted: 1986-05-13
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Expires: 2005-05-20
Abstract
Abstract A permanent magnet alloy that when used in the production of a permanent magnet results in a magnet that is highly resistant to disintegration when exposed to a combination of humidity and heat. Consequently, the alloy consists essentially of, in weight percent, 30 to 36 of at least one rare earth element, 60 to 66 iron, 6,000 to 35,000 ppm oxygen and balance boron.
Inventors
- 👤 Kalathur S. V. L. Narasimhan
- 👤 Carol J. Willman
- 👤 Edward J. Dulis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:37
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0575; H01F1/0577
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
A permanent magnet alloy consisting essentially of, in weight percent, 30 to 36 of at least one rare earth element, 60 to 66 iron, 6,000 to 35,000 ppm oxygen and balance boron.
Claim 2
Dependent Claim
32 words
A permanent magnet alloy consisting essentially of, in weight percent, 30 to 36 of at least one rare earth element, 60 to 66 iron, 6,000 to 35,000 ppm oxygen and balance boron.
Claim 3
Dependent Claim
16 words
The alloy of claim 1 wherein at least one of said rare earth elements is neodymium.
Claim 4
Dependent Claim
17 words
The magnet alloy of claim 2 wherein at least one of said rare earth elements is dysprosium.
Claim 5
Dependent Claim
32 words
A permanent magnet alloy consisting essentially of, in weight percent, 30 to 36 of at least one rare earth element, 60 to 66 iron, 9,000 to 30,000 ppm oxygen, and balance boron.
Claim 6
Dependent Claim
32 words
A permanent magnet alloy consisting essentially of, in weight percent, 30 to 36 of at least one rare earth element, 60 to 66 iron, 9,000 to 30,000 ppm oxygen, and balance boron.
Claim 7
Dependent Claim
16 words
The alloy of claim 4 wherein at least one of said rare earth elements is neodymium.
Claim 8
Dependent Claim
17 words
The magnet alloy of claim 4 wherein at least one of said rare earth elements is dysprosium.
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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |