US4200547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix-bonded permanent magnet having highly aligned magnetic particles
Assignee: SPS Technologies LLC
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Filing: 1979-01-02
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Granted: 1980-04-29
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Expires: 1999-01-02
Abstract
Abstract Matrix-bonded permanent magnet comprising anisotropic magnet particles which have an alignment exceeding 90%. The binder is a mixture of an amorphous hot-melt polyamide resin and a processing additive which is a cyclic nitrile derivative of a saturated fatty acid dimer.
Inventors
- 👤 Edward D. Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:39
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/10; H01F1/11; H01F1/113; H01F1/117; H01F1/04; H01F1/06; H01F1/08; H01F1/083; H01F7/00; H01F7/02; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
Matrix-bonded permanent magnet comprising magnetically-hard, anisotropic particles in a nonmagnetic binder, which particles comprise at least 60 volume percent of the magnet and have an alignment exceeding 90%, said binder consisting essentially of hot-melt polyamide resin which is essentially amorphous and has a ball-and-ring softening temperature of at least 50° C. and a processing additive which is a cyclic nitrile derivative of a saturated fatty acid dimer, which additive comprises 1-35% by weight of the total binder.
Claim 2
Dependent Claim
77 words
Matrix-bonded permanent magnet comprising magnetically-hard, anisotropic particles in a nonmagnetic binder, which particles comprise at least 60 volume percent of the magnet and have an alignment exceeding 90%, said binder consisting essentially of hot-melt polyamide resin which is essentially amorphous and has a ball-and-ring softening temperature of at least 50° C. and a processing additive which is a cyclic nitrile derivative of a saturated fatty acid dimer, which additive comprises 1-35% by weight of the total binder.
Claim 3
Dependent Claim
59 words
Matrix-bonded permanent magnet as defined in claim 1 wherein said hot-melt polyamide has the generalized formula ##STR4## wherein R 1 is the residue of one or more dibasic acids, R 2 is the residue of one or more diamines and n is an integer such that the hot-melt polyamide has a ball-and-ring softening temperature of at least 50° C.
Claim 4
Dependent Claim
23 words
Matrix-bonded permanent magnet as defined in claim 1 wherein said processing additive has the generalized formula C 36 H 66 N 2 .
Claim 5
Dependent Claim
25 words
Matrix-bonded permanent magnet as defined in claim 3 wherein said processing additive comprises ##STR5## wherein one of R' or R" is --RCN, R being alkyl.
Claim 6
Dependent Claim
29 words
Matrix-bonded permanent magnet as defined in claim 4 wherein one of R' is --(CH 2 ) 7 CN and the other is --(CH 2 ) 7 CH 3 .
Claim 7
Dependent Claim
15 words
Matrix-bonded permanent magnet as defined in claim 1 wherein said particles comprise barium ferrite particles.
Claim 8
Dependent Claim
15 words
Matrix-bonded permanent magnet as defined in claim 1 wherein said particles comprise samarium cobalt particles.
References Cited (Backward Citations)
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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) | 1983-04-29 | 1983-10-29 | 1984-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-04-29 | 1987-10-29 | 1988-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-04-29 | 1991-10-29 | 1992-04-29 | $7700.00 | Window Closed / Lapsed |