Patent US4863805A successfully refreshed from Google Patents.
US4863805A
Expired / Lapsed
US
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Rare earth-iron magnet
Assignee: SII Micro Parts Ltd
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Filing: 1987-06-08
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Granted: 1989-09-05
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Expires: 2007-06-08
Abstract
Abstract A rare earth-iron permanent magnet is comprised of compacted Re-B-R type alloy particles in which R represents at least one element selected from rare earth elements and yttrium. The magnet has a sealing agent filling voids between the compacted Fe-B-R type alloy particles and a coating layer formed on outer surfaces thereof. The coating layer is formed by coating the surfaces wrought in a desired magnet shape.
Inventors
- 👤 Teruo Suzuki
- 👤 Matsuo Kishi
- 👤 Katsuyoshi Muraishi
- 👤 Kenichi Ogawa
- 👤 Hiroshi Takashio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:30
CPC Classifications
H; H02; H02K; H02K15/00; H02K15/02; H02K15/03; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/047; H01F1/053; H01F1/055; H01F1/057; H01F1/0571; H01F1/0572; H01F1/0575; H01F1/0578; H01F41/00; H01F41/02; H01F41/0253; H01F41/026; H02K1/00; H02K1/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12097
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
70 words
A rare earth iron permanent magnet comprised of compacted Fe-B-R type alloy particles, in which R represents at least one element selected from rare earth elments and Y, a sealing agent filling voids between the compacted Fe-B-R type alloy particles, and a coating layer formed on the outer surface of the permanent magnet, said coating layer being formed by coating the permanent magnet surface wrought in a desired magnet shape.
Claim 2
Dependent Claim
70 words
A rare earth iron permanent magnet comprised of compacted Fe-B-R type alloy particles, in which R represents at least one element selected from rare earth elments and Y, a sealing agent filling voids between the compacted Fe-B-R type alloy particles, and a coating layer formed on the outer surface of the permanent magnet, said coating layer being formed by coating the permanent magnet surface wrought in a desired magnet shape.
Claim 3
Dependent Claim
17 words
A rare earth-iron permanent magnet according to claim 1, wherein the coating layer comprises a metal layer.
Claim 4
Dependent Claim
32 words
A rare earth-iron permanent magnet according to claim 2, wherein the metal layer is composed of two layers which comprise an underlayer of copper plating and an outer layer of nickel plating.
Claim 5
Dependent Claim
20 words
A rare earth-iron permanent magnet according to claim 3, wherein the underlayer of copper plating is applied by electroless plating.
Claim 6
Dependent Claim
17 words
A rare earth-iron permanent magnet according to claim 1, wherein the coating layer comprises an organic coating.
Claim 7
Dependent Claim
15 words
A rare earth-iron permanent magnet according to claim 5, wherein the organic coating comprises poly-p-xylene.
Claim 8
Dependent Claim
31 words
A rare earth-iron permanent magnet according to claim 1, wherein the Fe-B-R type alloy consists essentially of, by atomic percent, 8-30% R, 2-28% B and the balance being Fe with impurities.
Claim 9
Dependent Claim
39 words
A rare earth-iron permanent magnet according to claim 1, wherein the Fe-B-R type alloy consists essentially of, by atomic percent, 8-30% R, 2-28% B, more than zero and not exceeding 50% Co, and the balance being Fe with impurities.
Claim 10
Dependent Claim
17 words
A rare earth-iron permanent magnet according to claim 1, wherein the magnet is a sintered permanent magnet.
Claim 11
Dependent Claim
17 words
A rare earth-iron permanent magnet according to claim 1, wherein the coating layer comprises a plasma-polymerized coating.
Claim 12
Dependent Claim
32 words
A rare earth-iron permanent magnet according to claim 1, further comprising a sealing agent filling a defective portion of the resulting coating and voids present in the inside of the compacted magnet.
Claim 13
Dependent Claim
39 words
A rare earth-iron permanent magnet according to claim 1, wherein the sealing agent is at least one member selected from the group consisting of linseed oil, wax, varnish, water glass, polyester resin, phenolic resin, epoxy resin and anaerobic resin.
Claim 14
Dependent Claim
107 words
A permanent magnet comprising: compacted Fe-B-R type alloy particles, wherein R is at least one element selected from the group consisting of rare earth elements and yttrium, wherein voids between particles are sealed by a sealing agent and a coating layer is disposed on the outer surfaces of the permanent magnet, the permanent magnet being produced by providing the particles, compacting the particles to obtain a compact, sintering the compact to obtain a sintered compact, working the sinterd compact to produce a desired permanent magnet shape, filling the voids between the alloy particles with the sealing agent, and coating the outer surfaces thereof with the coating layer.
Claim 15
Dependent Claim
107 words
A permanent magnet comprising: compacted Fe-B-R type alloy particles, wherein R is at least one element selected from the group consisting of rare earth elements and yttrium, wherein voids between particles are sealed by a sealing agent and a coating layer is disposed on the outer surfaces of the permanent magnet, the permanent magnet being produced by providing the particles, compacting the particles to obtain a compact, sintering the compact to obtain a sintered compact, working the sinterd compact to produce a desired permanent magnet shape, filling the voids between the alloy particles with the sealing agent, and coating the outer surfaces thereof with the coating layer.
Claim 16
Dependent Claim
17 words
A rare earth-iron permanent magnet according to claim 13, wherein the coating layer comprises a metal layer.
Claim 17
Dependent Claim
32 words
A rare earth-iron permanent magnet according to claim 14, wherein the metal layer is composed of two layers which comprise an underlayer of copper plating and an outer layer of nickel plating.
Claim 18
Dependent Claim
20 words
A rare earth-iron permanent magnet according to claim 15, wherein the underlayer of copper plating is applied by electroless plating.
Claim 19
Dependent Claim
17 words
A rare earth-iron permanent magnet according to claim 13, wherein the coating layer comprises an organic coating.
Claim 20
Dependent Claim
15 words
A rare earth-iron permanent magnet according to claim 17, wherein the organic coating comprises poly-p-xylene.
Claim 21
Dependent Claim
31 words
A rare earth-iron permanent magnet according to claim 13, wherein the Fe-B-R type alloy consists essentially of, by atomic percent, 8-30% R, 2-28% B and the balance being Fe with impurities.
Claim 22
Dependent Claim
58 words
A rare earth-iron permanent magnet according to claim 13, wherein the Fe-B-R type alloy consists essentially of, by atomic percent, 8-30% ron permanent magnet according to claim 13, wherein the Fe-B-R type alloy consists essentially of, by atomic percent, 8-30% R, 2-28% B, more than zero and not exceeding 50% Co, and the balance being Fe with impurities.
Claim 23
Dependent Claim
17 words
A rare earth-iron permanent magnet according to claim 13, wherein the coating layer comprises a plasma-polymerized coating.
Claim 24
Dependent Claim
32 words
A rare earth-iron permanent magnet according to claim 13, further comprising a sealing agent filling a defective portion of the resulting coating and voids present in the inside of the compacted magnet.
Claim 25
Dependent Claim
39 words
A rare earth-iron permanent magnet according to claim 13, wherein the sealing agent is at least one member selected from the group consisting of linseed oil, wax, varnish, water glass, polyester resin, phenolic resin, epoxy resin and anaerobic resin.
Claim 26
Dependent Claim
102 words
A rare earth-iron permanent magnet comprised of compacted Fe-B-R type alloy particles, in which R represents at least one element selected from rare earth elements and Y, a sealing agent filling voids between the compacted Fe-B-R type alloy particles, and a coating layer formed on the outer surfaces of the permanent magnet, the magnet being produced by preparing Fe-B-R type alloy particles, compacting the particles to provide a compact, sintering the resulting compact to provide a sintered product, working the sintered product to provide a permanent magnet, filling the voids between the alloy particles, and coating the surfaces of the permanent magnet.
Claim 27
Dependent Claim
102 words
A rare earth-iron permanent magnet comprised of compacted Fe-B-R type alloy particles, in which R represents at least one element selected from rare earth elements and Y, a sealing agent filling voids between the compacted Fe-B-R type alloy particles, and a coating layer formed on the outer surfaces of the permanent magnet, the magnet being produced by preparing Fe-B-R type alloy particles, compacting the particles to provide a compact, sintering the resulting compact to provide a sintered product, working the sintered product to provide a permanent magnet, filling the voids between the alloy particles, and coating the surfaces of the permanent magnet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |