US3609611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for stabilizing permanent magnets
Assignee: Individual
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Filing: 1969-09-26
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Granted: 1971-09-28
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Expires: 1989-09-26
Abstract
Abstract Method and apparatus for stabilizing permanent magnets, that is, reducing the flux density of a magnet in a predetermined direction to a preselected value. The magnet first is magnetized in the desired direction to a flux density greater than the preselected value and preferably to saturation. Thereafter, the magnet is progressively magnetized in a perpendicular direction and this correspondingly reduces the flux density in the desired direction. This magnetization in the perpendicular direction continues until the flux density in the desired direction has been reduced to the preselected value.
Inventors
- 👤 Robert A Parnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:14
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/003
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
107 words
A method of magnetizing a piece of magnetic material to a preselected flux density along a predetermined direction relative to said piece, said method comprising the steps of magnetizing said piece in said predetermined direction to a flux density value above said preselected value, thereafter moving said piece into a progressively increasing magnetic field with the piece oriented relative to the field to progressively magnetize said piece in a direction perpendicular to said predetermined direction to progressively reduce the flux density in said predetermined direction, and removing said piece from said field when the flux density in said predetermined direction has been reduced to said preselected value.
Claim 2
Independent Claim
107 words
A method of magnetizing a piece of magnetic material to a preselected flux density along a predetermined direction relative to said piece, said method comprising the steps of magnetizing said piece in said predetermined direction to a flux density value above said preselected value, thereafter moving said piece into a progressively increasing magnetic field with the piece oriented relative to the field to progressively magnetize said piece in a direction perpendicular to said predetermined direction to progressively reduce the flux density in said predetermined direction, and removing said piece from said field when the flux density in said predetermined direction has been reduced to said preselected value.
Claim 3
Independent Claim
173 words
A method of magnetizing a piece of magnet material to a preselected flux density value along a predetermined direction and using a permanent magnet having an airgap which tapers progressively from a wide end to a narrow end, said method comprising the steps of magnetizing said piece along said predetermined direction to a flux density value above said preselected value, said predetermined direction thereby becoming the axis between the north and south poles of the magnetized piece, placing said piece at the wide end of said airgap with said axis perpendicular to the flux path of said permanent magnet across the gap, progressively moving said piece into said gap without changing the orientation of the piece relative to said permanent magnet thereby to progressively magnetize said piece in a direction perpendicular to said axis and correspondingly reduce the flux density of the piece along said axis, and stopping, the movement of said piece through said gap when the flux density of said piece along said axis has been reduced to said preselected value.
Claim 4
Independent Claim
173 words
A method of magnetizing a piece of magnet material to a preselected flux density value along a predetermined direction and using a permanent magnet having an airgap which tapers progressively from a wide end to a narrow end, said method comprising the steps of magnetizing said piece along said predetermined direction to a flux density value above said preselected value, said predetermined direction thereby becoming the axis between the north and south poles of the magnetized piece, placing said piece at the wide end of said airgap with said axis perpendicular to the flux path of said permanent magnet across the gap, progressively moving said piece into said gap without changing the orientation of the piece relative to said permanent magnet thereby to progressively magnetize said piece in a direction perpendicular to said axis and correspondingly reduce the flux density of the piece along said axis, and stopping, the movement of said piece through said gap when the flux density of said piece along said axis has been reduced to said preselected value.
Claim 5
Dependent Claim
103 words
Apparatus for reducing the flux density of a permanent magnet along its north-south axis to a preselected value, said apparatus having, in combination, a magnet having opposed pole faces defining an airgap which tapers gradually from a wide end to a narrow end, a support having a loading position alongside the wide end of said airgap and adapted to carry the permanent magnet with its north-south axis perpendicular to the flux path across said airgap, and means for moving said support progressively into said airgap until the flux density of the permanent magnet along said axis has been reduced to said preselected value.
Claim 6
Dependent Claim
103 words
Apparatus for reducing the flux density of a permanent magnet along its north-south axis to a preselected value, said apparatus having, in combination, a magnet having opposed pole faces defining an airgap which tapers gradually from a wide end to a narrow end, a support having a loading position alongside the wide end of said airgap and adapted to carry the permanent magnet with its north-south axis perpendicular to the flux path across said airgap, and means for moving said support progressively into said airgap until the flux density of the permanent magnet along said axis has been reduced to said preselected value.
Claim 7
Dependent Claim
18 words
Apparatus as defined by claim 3 in which the magnet forming said tapered airgap is a permanent magnet.
Claim 8
Dependent Claim
34 words
Apparatus as defined by claim 3 including a measuring device, said measuring device including a sensor mounted on said support and operable to measure the magnetization of said permanent magnet along said north-south axis.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |