US5063004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of permanent magnet toroidal rings
Assignee: United States Department of the Army
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Filing: 1989-11-03
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Granted: 1991-11-05
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Expires: 2009-11-03
Abstract
Abstract A hollow cylindrical flux source (HCFS) is formed into a toroidal shape. A hollow toroidal of magnetically neutral material is mounted in the central cavity of the toroidal flux source. The hollow toroidal has a central coaxial toroidal cavity of given cross-section (e.g., rectangular). The toroid flux source and the hollow toroid are each equatorially split into two halves. When the two halves are brought into juxtaposition and a suspension of magnetic material is deposited in the coaxial toroidal cavity a permanent magnet toroidal ring will be fabricated.
Inventors
- 👤 Herbert A. Leupold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:32
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/008; H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273; H01F41/028; Y; Y10; Y10S; Y10S264/00; Y10S264/58
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A method for fabricating a permanent magnet toroidal ring comprising the steps of forming a hollow cylindrical permanent magnet flux source into a toroidal shape, splitting the toroidal flux source into two halves through its major equator, mounting two halves of a hollow toroid of magnetically neutral material into the two halves of the toroidal flux source, placing the two halves of the toroidal flux source in juxtaposition, depositing an unmagnetized suspension of magnetic material into the cavity of the toroid of neutral material, allowing time for the magnetic material to set and be magnetized, separating the halves of the toroidal flux source, and removing the permanent magnet toroidal ring from within the toroid of neutral material.
Claim 2
Independent Claim
117 words
A method for fabricating a permanent magnet toroidal ring comprising the steps of forming a hollow cylindrical permanent magnet flux source into a toroidal shape, splitting the toroidal flux source into two halves through its major equator, mounting two halves of a hollow toroid of magnetically neutral material into the two halves of the toroidal flux source, placing the two halves of the toroidal flux source in juxtaposition, depositing an unmagnetized suspension of magnetic material into the cavity of the toroid of neutral material, allowing time for the magnetic material to set and be magnetized, separating the halves of the toroidal flux source, and removing the permanent magnet toroidal ring from within the toroid of neutral material.
Claim 3
Dependent Claim
26 words
A method as defined in claim 1 wherein said suspension is injected via an injection port into the cavity of the toroid of magnetically neutral material.
Claim 4
Dependent Claim
30 words
A method as defined in claim 1 wherein the magnetic flux source is formed into a toroidal shape so as to produce an axial magnetic field in its central cavity.
Claim 5
Dependent Claim
30 words
A method as defined in claim 1 wherein the magnetic flux source is formed into a toroidal shape so as to produce a radial magnetic field in its central cavity.
Claim 6
Dependent Claim
46 words
A method as defined in claim 1 wherein the magnetic flux source is formed into a toroidal shape so as to produce in its central cavity a magnetic field at a predetermined angle less than 90 with respect to the axis of the toroidal flux source.
References Cited (Backward Citations)
US4678616A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |