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Patent US3821034A successfully refreshed from Google Patents.
US3821034A
Expired / Lapsed
US
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High-density high-energy anisotropically permanent magnet
Assignee: US Philips Corp
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Filing: 1971-07-16
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Granted: 1974-06-28
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Expires: 1991-07-16
Abstract
Abstract A permanent magnet consisting of a compact mass of magnetically anisotropic powder having a theoretical density of which is at least 85 percent of the theoretical density and the magnetization in the direction of magnetization is at least 90 percent of the saturation magnetization.
Inventors
- 👤 F Frederik
- 👤 W Luiten
- 👤 Kort G De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:25
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; B; B22; B22F; B22F3/00; B22F3/02; B22F3/04; H01F1/06; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
A permanent magnet as claimed in claim 1 in which M is Co and R is Sm and said magnet has an energy product (BH)Max of at least 14 X 106 Gauss-oersted
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |