US4614929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacture of magnet
Assignee: Marelli Corp
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Filing: 1985-03-25
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Granted: 1986-09-30
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Expires: 2005-03-25
Abstract
Abstract A method for the manufacture of an annular magnet, which comprises depositing, on the opposite sides of an annular material of magnetic substance, magnetizing members regularly spaced circumferentially in conformity with the shape of said annular material and opposed perpendicularly to each other across said annular material and forming magnetic fluxes through paired magnetizing members in alternately opposite directions thereby magnetizing said interposed annular material.
Inventors
- 👤 Takaaki Tsukuda
- 👤 Toyohiko Hata
- 👤 Akira Fujisaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:17
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/003
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A method for the manufacture of an annular magnet, which comprises depositing, on the opposite sides of an annular material of magnetic substance, magnetizing members regularly spaced circumferentially in conformity with the shape of said annular material and opposed perpendicularly to each other across said annular material and forming magnetic fluxes through paired magnetizing members in alternately opposite directions thereby magnetizing said interposed annular material.
Claim 2
Independent Claim
65 words
A method for the manufacture of an annular magnet, which comprises depositing, on the opposite sides of an annular material of magnetic substance, magnetizing members regularly spaced circumferentially in conformity with the shape of said annular material and opposed perpendicularly to each other across said annular material and forming magnetic fluxes through paired magnetizing members in alternately opposite directions thereby magnetizing said interposed annular material.
Claim 3
Dependent Claim
68 words
A method according to claim 1, wherein said magnetizing members are formed of an even number of projected parts regularly spaced circumferentially by a fixed distance equal to the width of neutral zones to be formed in the produced magnet and said projected parts have a conductor wire wound thereon in such a manner that the electric current flows in mutually opposite directions between the adjacent projected parts.
Claim 4
Dependent Claim
15 words
A method according to claim 1, wherein said annular material is mounted on a yoke.
Claim 5
Dependent Claim
15 words
A method according to claim 1, wherein said annular material is in a flat shape.
References Cited (Backward Citations)
US3139567A
Cited
JPS54152200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-29 | 1990-03-31 | 1990-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-29 | 1994-03-31 | 1994-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-29 | 1998-03-31 | 1998-09-30 | $7700.00 | Window Closed / Lapsed |