Patent US2166969A successfully refreshed from Google Patents.
US3602986A
Expired / Lapsed
US
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Method of fabricating radially oriented magnets
Assignee: EIDP Inc
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Filing: 1969-10-31
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Granted: 1971-09-07
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Expires: 1989-10-31
Abstract
Abstract A method of fabricating radially oriented particle disc or arc magnets comprising forming a flexible sheet containing magnetic particles with their easy magnetic axes perpendicular to the sheet surface, winding the sheet, cutting to the desired configuration, laminating each cut portion, and sintering each laminated portion to form the finished permanent magnet. The fabricated anisotropic magnets produced by the process of this invention can be used in eddy current devices and permanent magnet DC motors.
Inventors
- 👤 Joel A Conwicke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:28
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273; H01F41/028; Y; Y10; Y10S; Y10S264/00; Y10S264/58; Y10S428/00; Y10S428/90; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49075; Y10T29/49076
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
77 words
A method of fabricating ceramic magnets having a radial particle orientation comprising, forming a flexible sheet containing organically bonded magnetic particles in which the easy magnetic axes of the particles is perpendicular to the sheet surface, winding said sheet in the form of a cylinder to provide radial particle orientation, cutting from said cylinder portions having the desired configuration, laminating each cut portion, and sintering each laminated cut portion to complete the formation of the ceramic magnets.
Claim 2
Independent Claim
77 words
A method of fabricating ceramic magnets having a radial particle orientation comprising, forming a flexible sheet containing organically bonded magnetic particles in which the easy magnetic axes of the particles is perpendicular to the sheet surface, winding said sheet in the form of a cylinder to provide radial particle orientation, cutting from said cylinder portions having the desired configuration, laminating each cut portion, and sintering each laminated cut portion to complete the formation of the ceramic magnets.
Claim 3
Independent Claim
90 words
A method of fabricating ceramic magnets having a radial particle orientation comprising, forming a dispersion of magnetic particles in an organic binder system, applying the dispersion to a smooth surface to form a thin sheet while maintaining a magnetic field to align the particles with their easy axis perpendicular to the sheet surface, drying the sheet, winding the sheet to form a cylinder, cutting from said cylinder portions having the desired configuration, laminating each cut portion, and sintering each laminated cut portion to complete the formation of the ceramic magnets.
Claim 4
Independent Claim
90 words
A method of fabricating ceramic magnets having a radial particle orientation comprising, forming a dispersion of magnetic particles in an organic binder system, applying the dispersion to a smooth surface to form a thin sheet while maintaining a magnetic field to align the particles with their easy axis perpendicular to the sheet surface, drying the sheet, winding the sheet to form a cylinder, cutting from said cylinder portions having the desired configuration, laminating each cut portion, and sintering each laminated cut portion to complete the formation of the ceramic magnets.
Claim 5
Dependent Claim
24 words
A method in accordance with claim 2 wherein the magnetic particles are selected from the group consisting of BaFe12019, SrFe12019, PbFe12019 and mixtures thereof.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 3 wherein the magnetic particles are single domain particles.
Claim 7
Dependent Claim
24 words
A method of fabricating ceramic magnets in accordance with claim 2 wherein the laminating is carried out by the action of heat and pressure.
Claim 8
Dependent Claim
27 words
A method of fabricating ceramic magnets in accordance with claim 2 wherein the magnetic field used to align the particles is within the range of 400-4,000 oersted.
Claim 9
Dependent Claim
19 words
A mEthod of fabricating ceramic magnets in accordance with claim 2 wherein the sheet is formed by doctor blading.
Claim 10
Dependent Claim
19 words
A method of fabricating ceramic magnets in accordance with claim 2 wherein the sheet is wound on a mandrel.
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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |