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US5213703A
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Anisotropic neodymium-iron-boron system plastic bonded magnet
Assignee: Panasonic Holdings Corp
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Filing: 1992-05-27
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Granted: 1993-05-25
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Expires: 2012-05-27
Abstract
Abstract This invention relates to an anisotropic neodymium-iron-boron system plastic bonded magnet containing from 10 to 20% by weight an anisotropic neodymium-iron boron system magnetic powder having a grain-size distribution from 10 to 49 microns and a resin binder. By employing this constitution, a substantially improved (BH)max of the compressed mold body, due to improved magnetic field orientation, is realized.
Inventors
- 👤 Shizuo Furuyama
- 👤 Kiyoshi Kojima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:47
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; H01F1/0578
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
An anisotropic NEODYMIUM-IRON-BORON system plastic bonded magnet consisting essentially of: a resin binder, in amount greater than 1.4% by weight and less than 3.0% by weight and an anisotropic NEODYMIUM-IRON-BORON system magnetic powder consisting essentially of 10 to 20% by weight of particles having a rounded shape and having a size of 10 to 49 micrometers and 80 to 90% by weight of particles having a rounded shape and having a particle size of 50 to 500 micrometers.
Claim 2
Dependent Claim
78 words
An anisotropic NEODYMIUM-IRON-BORON system plastic bonded magnet consisting essentially of: a resin binder, in amount greater than 1.4% by weight and less than 3.0% by weight and an anisotropic NEODYMIUM-IRON-BORON system magnetic powder consisting essentially of 10 to 20% by weight of particles having a rounded shape and having a size of 10 to 49 micrometers and 80 to 90% by weight of particles having a rounded shape and having a particle size of 50 to 500 micrometers.
Claim 3
Dependent Claim
31 words
The anisotropic NEODYMIUM-IRON-BORON system plastic bonded magnet according to claim 1, wherein during the preparation thereof said powder is pulverized, and dispersed with said resin binder in a high-speed shearing machine.
Claim 4
Dependent Claim
36 words
The anisotropic neodymium-iron-boron system plastic bonded magnet according to claim 1, wherein the resin binder is an epoxy resin including an amine aduct of the epoxy resin as a latent hardening agent for said epoxy resin.
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) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |