US4190548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic bonded permanent magnet and method of making same
Assignee: Individual
•
Filing: 1978-07-19
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Granted: 1980-02-26
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Expires: 1998-07-19
Abstract
Abstract A plastic bonded permanent magnet including particles of permanent magnet material having a high affinity for oxygen, such as ultra-fine grain iron, bismuth-manganese and cobalt rare earth magnetic materials, dispersed within a substantially oxygen free plastic.
Inventors
- 👤 Max Baermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:32
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F1/00; H01F1/01; H01F1/03; H01F1/032; H01F1/04; H01F1/06; H01F1/08; H01F1/083
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
32 words
In a plastic bonded permanent magnet including particles of a cobalt-rare earth alloy permanent magnet material dispersed within a plastic binder, the improvement comprising: said binder being a substantially oxygen free plastic.
Claim 2
Dependent Claim
32 words
In a plastic bonded permanent magnet including particles of a cobalt-rare earth alloy permanent magnet material dispersed within a plastic binder, the improvement comprising: said binder being a substantially oxygen free plastic.
Claim 3
Dependent Claim
12 words
The improvement as defined in claim 1 wherein said plastic is polystyrene.
Claim 4
Independent Claim
86 words
A method of making a plastic bonded permanent magnet, said method comprising the steps of: (a) providing particles of cobalt-rare earth alloy permanent magnet material; (b) providing a magnet binder material of substantially oxygen free plastic; (c) mixing with said plastic a substantially oxygen free solvent for said plastic until said plastic and solvent form a solution; (d) then mixing said particles and said solution to provide a mixture; and , (e) then causing said solvent to be evaporated from said plastic binder in said mixture.
Claim 5
Independent Claim
86 words
A method of making a plastic bonded permanent magnet, said method comprising the steps of: (a) providing particles of cobalt-rare earth alloy permanent magnet material; (b) providing a magnet binder material of substantially oxygen free plastic; (c) mixing with said plastic a substantially oxygen free solvent for said plastic until said plastic and solvent form a solution; (d) then mixing said particles and said solution to provide a mixture; and , (e) then causing said solvent to be evaporated from said plastic binder in said mixture.
Claim 6
Dependent Claim
21 words
A method as defined in claim 3 wherein said mixing of said particles and said solution is by stirring said twocomponents.
Claim 7
Dependent Claim
23 words
A method as defined in claim 3 wherein said mixing of said particles and said solution is in a substantially oxygen free atmosphere.
Claim 8
Dependent Claim
23 words
A method as defined in claim 3 wherein said evaporated solvent is sucked from around said mixture of said particles and said solution.
Claim 9
Dependent Claim
24 words
A method as defined in claim 3 wherein the ratio of plastic material to magnetic powder is such that said mixture crumbles into granules.
Claim 10
Dependent Claim
34 words
A method as defined in claim 3 including the additional steps of: (f) forming a magnet from said mixture; and, (g) compressing said magnet to reduce the amount of said plastic in said mixture.
Claim 11
Dependent Claim
25 words
A method as defined in claim 3 wherein said particles are anisotropic and including the additional step of: (f) magnetizing said mixture before said evaporation.
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) | 1983-02-25 | 1983-08-27 | 1984-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-25 | 1987-08-27 | 1988-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-25 | 1991-08-27 | 1992-02-26 | $7700.00 | Window Closed / Lapsed |