US4764743A
Expired / Lapsed
US
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Permanent magnet structures for the production of transverse helical fields
Assignee: United States Department of the Army
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Filing: 1987-10-26
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Granted: 1988-08-16
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Expires: 2007-10-26
Abstract
Abstract Permanent magnet structures in several alternative forms are fabricated f multiplicities of permanent magnet segments of magnetic materials, preferably rare earth compounds, with the segments displaced radially from each other progressively along the structures elongate axes so as to produce a heliform magnetic field extending centrally in a passage through the structure.
Inventors
- 👤 Herbert A. Leupold
- 👤 II Ernest Potenziani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:12
CPC Classifications
H; H01; H01F; H01F7/00; H01F7/02; H01F7/0273; H01F7/0278
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A permanent magnet apparatus to produce a helically oriented magnetic field comprising, in combinations; a multiplicity of polygonal similarly magnetized magnet segments, each having a generally centrally disposed hole therethrough, arranged concentrically on an elongate axis with said holes in substantial registration along said axis to define an elongate axial passage extending through said apparatus; each respective said similarly magnetized magnet segment displaced radially on said elongate axis from its respective adjacent segment.
Claim 2
Dependent Claim
73 words
A permanent magnet apparatus to produce a helically oriented magnetic field comprising, in combinations; a multiplicity of polygonal similarly magnetized magnet segments, each having a generally centrally disposed hole therethrough, arranged concentrically on an elongate axis with said holes in substantial registration along said axis to define an elongate axial passage extending through said apparatus; each respective said similarly magnetized magnet segment displaced radially on said elongate axis from its respective adjacent segment.
Claim 3
Dependent Claim
30 words
Apparatus according to claim 1 wherein each similarly magnetized segment comprises a relatively short length of a rectangular cross sectioned bar magnet with an axial passage extending substantially centrally therethrough.
Claim 4
Dependent Claim
40 words
Apparatus according to claim 1 wherein each similarly magnetized segment comprises a relatively short length of an array of trapezoidal cross-sectioned elongate bar magnets arranged and disposed to define a polygonal cross-section with an elongate axial passage extending centrically therethrough.
Claim 5
Dependent Claim
68 words
Apparatus according to claim 1 wherein each similarly magnetized segment comprises a relatively short length of an array comprising bar magnets, cladding magnets, bucking magnets, pole pieces, and ring elements, arranged and disposed to define an axial passage extending substantially centrally therethrough and wherein magnetic flux produced by said bar magnets is maintained in substantially uniform density by said cladding magnets, bucking magnets, pole pieces, and ring elements.
Claim 6
Dependent Claim
14 words
Apparatus according to claim 1 wherein said magnet segments comprise rare earth compound material.
Claim 7
Dependent Claim
14 words
Apparatus according to claim 2 wherein said magnet segments comprise rare earth compound materials.
Claim 8
Dependent Claim
14 words
Apparatus according to claim 3 wherein said magnet segments comprise rare earth compound materials.
Claim 9
Dependent Claim
14 words
Apparatus according to claim 4 wherein said magnet segments comprise rare earth compound materials.
References Cited (Backward Citations)
US3067365A
Cited
US3643311A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |