Patent US4911627A successfully refreshed from Google Patents.
US4911627A
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Apparatus for fabrication of permanent magnet toroidal rings
Assignee: United States Department of the Army
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Filing: 1989-01-26
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Granted: 1990-03-27
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Expires: 2009-01-26
Abstract
Abstract A hollow cylindrical flux source (HCFS) is formed into a toroidal shape. A hollow toroid of magnetically neutral material is mounted in the central cavity of the toroidal flux source. The hollow toroid 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 07:11
CPC Classifications
H; H01; H01F; H01F41/00; H01F41/02; H01F41/0253; H01F41/0273; H01F41/028; B; B30; B30B; B30B11/00; B30B11/008; Y; Y10; Y10S; Y10S425/00; Y10S425/033
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
62 words
Apparatus for fabricating permanent magnet toroidal rings comprising a hollow cylindrical magnetic flux source for producing a uniform high-field in its central cavity, said magnetic flux source being formed in a toroidal shape, and a hollow toroid of magnetically neutral material closely mounted in the central cavity of the formed toroidal flux source, said hollow toroid having a central coaxial toroidal cavity.
Claim 2
Dependent Claim
62 words
Apparatus for fabricating permanent magnet toroidal rings comprising a hollow cylindrical magnetic flux source for producing a uniform high-field in its central cavity, said magnetic flux source being formed in a toroidal shape, and a hollow toroid of magnetically neutral material closely mounted in the central cavity of the formed toroidal flux source, said hollow toroid having a central coaxial toroidal cavity.
Claim 3
Dependent Claim
15 words
Apparatus as defined in claim 1 wherein said coaxial toroidal cavity is of rectangular cross-section.
Claim 4
Dependent Claim
23 words
Apparatus as defined in claim 2 wherein said formed toroidal flux source and said hollow toroid are each equatorially split into two halves.
Claim 5
Dependent Claim
20 words
Apparatus as defined in claim 3 wherein the toroidal flux source produces an axial magnetic field in its central cavity.
Claim 6
Dependent Claim
20 words
Apparatus as defined in claim 3 wherein the toroidal flux source produces a radial magnetic field in its central cavity.
Claim 7
Dependent Claim
32 words
Apparatus as defined in claim 3 wherein the toroidal flux source produces in its central cavity a magnetic field at any angle with respect to the axis of the toroidal flux source.
Claim 8
Dependent Claim
25 words
Apparatus as defined in claim 3 wherein an injection port extends from said coaxial toroidal cavity to the outer periphery of the toroidal flux source.
Claim 9
Dependent Claim
23 words
Apparatus as defined in claim 7 wherein the two halves of the toroidal flux source are mounted in a pair of die supports.
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) | 1993-03-26 | 1993-09-25 | 1994-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-26 | 1997-09-25 | 1998-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-26 | 2001-09-25 | 2002-03-27 | $7700.00 | Window Closed / Lapsed |